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Dorsal aspect of right forearm Superficial vessels and nerves; antibrachial fascia The skin has been removed except at the borders of the forearm and hand. The proximal third of the forearm is not shown. 1 . Dorsal antebrachial cutaneous nerve 2 . Antibrachial fascia 3 . Cephalic vein (and tributary veins) 4 . Superficial branch of radial nerve 5 . Dorsal venous rete of the hand 6 . Dorsal metacarpal veins 7 . Digital venous arch 8 . Dorsal hand branch of ulnar nerve 9 . Location of styloid process of ulna 10 . Skin and superficial fascia at margin of dissection

Identify the following parts

Dorsal aspect of right forearm Superficial vessels and nerves; antibrachial fascia The skin has been removed except at the borders of the forearm and hand. The proximal third of the forearm is not shown. 1 . Dorsal antebrachial cutaneous nerve 2 . Antibrachial fascia 3 . Cephalic vein (and tributary veins) 4 . Superficial branch of radial nerve 5 . Dorsal venous rete of the hand 6 . Dorsal metacarpal veins 7 . Digital venous arch 8 . Dorsal hand branch of ulnar nerve 9 . Location of styloid process of ulna 10 . Skin and superficial fascia at margin of dissection

Identify the following parts

Lateral aspect of right hand Insertion and of second lumbrical and second dorsal interosseous muscles on lateral side of middle finger The index finger has been removed by transecting the second metacarpal bone and the muscles, vessels and nerves of the finger. The second lumbrical and second dorsal interosseous muscles can be traced to their insertions on the middle finger. The latter muscle inserts partly into the extensor expansion (2) and partly into the base of the first phalanx. Fascia (18) of the lumbrical muscle has been incised and reflected to demonstrate the "lumbrical canal." 1 . Ligament of digital sheath 2 . Left pointer: Extensor expansion Right pointer: Location of metacarpophalangeal joint 3 . Dorsal interosseous muscle II (left pointer, insertion into extensor expansion; right pointer, insertion into base of proximal phalanx) 4 . Lumbrical muscle II 5 . Deep transverse metacarpal ligament 6 . Dorsal metacarpal artery II 7 . Anterior interosseous muscle I 8 . Metacarpal II (transected) 9 . Common extensor digitorum muscle (tendon to index finger, transected) 10 . Branch dorsal metacarpal artery I (dorsal digital artery) 11 . Dorsal interosseous muscle I 12 . Adductor pollicis muscle (transverse head) 13 . Superficial palmar arch 14 . Left pointer: Flexor digitorum superficialis (cut) Middle pointer: Flexor digitorum profundus muscle (cut) Right pointer: Lumbrical muscle I 15 . Left pointer: Anterior common digital artery Right pointer: Common palmar digital nerve of median nerve 16 . Fascial septa which extended from palmar aponeurosis (removed) to anterior interosseous fascia and, indirectly, to metacarpal bones 17 . Anterior interosseous fascia 18 . Fascial extension around lumbrical muscle II (incised and reflected to expose "lumbrical canal")

Identify the following parts

Lateral aspect of right hand Insertion and of second lumbrical and second dorsal interosseous muscles on lateral side of middle finger The index finger has been removed by transecting the second metacarpal bone and the muscles, vessels and nerves of the finger. The second lumbrical and second dorsal interosseous muscles can be traced to their insertions on the middle finger. The latter muscle inserts partly into the extensor expansion (2) and partly into the base of the first phalanx. Fascia (18) of the lumbrical muscle has been incised and reflected to demonstrate the "lumbrical canal." 1 . Ligament of digital sheath 2 . Left pointer: Extensor expansion Right pointer: Location of metacarpophalangeal joint 3 . Dorsal interosseous muscle II (left pointer, insertion into extensor expansion; right pointer, insertion into base of proximal phalanx) 4 . Lumbrical muscle II 5 . Deep transverse metacarpal ligament 6 . Dorsal metacarpal artery II 7 . Anterior interosseous muscle I 8 . Metacarpal II (transected) 9 . Common extensor digitorum muscle (tendon to index finger, transected) 10 . Branch dorsal metacarpal artery I (dorsal digital artery) 11 . Dorsal interosseous muscle I 12 . Adductor pollicis muscle (transverse head) 13 . Superficial palmar arch 14 . Left pointer: Flexor digitorum superficialis (cut) Middle pointer: Flexor digitorum profundus muscle (cut) Right pointer: Lumbrical muscle I 15 . Left pointer: Anterior common digital artery Right pointer: Common palmar digital nerve of median nerve 16 . Fascial septa which extended from palmar aponeurosis (removed) to anterior interosseous fascia and, indirectly, to metacarpal bones 17 . Anterior interosseous fascia 18 . Fascial extension around lumbrical muscle II (incised and reflected to expose "lumbrical canal")

Identify the following parts

Lateral aspect of right hand Nerve and blood supply to first dorsal interosseous muscle The muscle has been detached from its origin on the first metacarpal bone and dissected. The course of the deep branch of the ulnar nerve toward its point of entry into this muscle is shown in 105-1. 1 . Common extensor digitorum muscle (tendon to index finger) 2 . Extensor indicis muscle (tendon of insertion) 3 . Dorsal metacarpal artery II 4 . Metacarpal II 5 . Dorsal interosseous muscle II (dorsal interosseous fascia removed) 6 . Dorsal metacarpal artery III 7 . Dorsal metacarpal artery I (displaced) 8 . Extensor carpi radialis brevis muscle (tendon of insertion) 9 . Extensor carpi radialis longus muscle (tendon of insertion) 10 . Radial artery 11 . Metacarpotrapezial joint capsule 12 . Radial artery continuing into deep palmar arch 13 . Dorsal digital arteries 14 . Muscular branch radial artery (to dorsal interosseous muscle I) 15 . Muscular branch of ulnar nerve (to dorsal interosseous muscle I) 16 . Dorsal interosseous muscle I (dissected) 17 . Extensor pollicis brevis muscle (tendon of insertion) 18 . Extensor pollicis longus muscle (tendon of insertion) 19 . Extensor expansion of thumb 20 . Distal continuation of tendon of of extensor pollicis longus muscle

Identify the following parts

Lateral aspect of right hand Nerve and blood supply to first dorsal interosseous muscle The muscle has been detached from its origin on the first metacarpal bone and dissected. The course of the deep branch of the ulnar nerve toward its point of entry into this muscle is shown in 105-1. 1 . Common extensor digitorum muscle (tendon to index finger) 2 . Extensor indicis muscle (tendon of insertion) 3 . Dorsal metacarpal artery II 4 . Metacarpal II 5 . Dorsal interosseous muscle II (dorsal interosseous fascia removed) 6 . Dorsal metacarpal artery III 7 . Dorsal metacarpal artery I (displaced) 8 . Extensor carpi radialis brevis muscle (tendon of insertion) 9 . Extensor carpi radialis longus muscle (tendon of insertion) 10 . Radial artery 11 . Metacarpotrapezial joint capsule 12 . Radial artery continuing into deep palmar arch 13 . Dorsal digital arteries 14 . Muscular branch radial artery (to dorsal interosseous muscle I) 15 . Muscular branch of ulnar nerve (to dorsal interosseous muscle I) 16 . Dorsal interosseous muscle I (dissected) 17 . Extensor pollicis brevis muscle (tendon of insertion) 18 . Extensor pollicis longus muscle (tendon of insertion) 19 . Extensor expansion of thumb 20 . Distal continuation of tendon of of extensor pollicis longus muscle

Identify the following parts

Lateral aspect of right hand Relations of first dorsal interosseous, first lumbrical and adductor pollicis muscles The fascia has been removed from the muscles. 1 . Position of metacarpophalangeal joint of index finger 2 . Lumbrical muscle I 3 . Branch dorsal metacarpal artery I (dorsal digital artery) 4 . Dorsal digital nerves of radial nerve 5 . Dorsal interosseous muscle I 6 . Adductor pollicis muscle (transverse head) 7 . Branch dorsal metacarpal artery I (dorsal digital artery) 8 . Tributary to cephalic vein 9 . Abductor pollicis brevis muscle 10 . Metacarpal I 11 . Extensor pollicis brevis muscle (tendon of insertion) 12 . Extensor pollicis longus muscle (tendon of insertion) 13 . Position of metacarpophalangeal joint of thumb 14 . Extensor expansion 15 . Proper palmar digital nerve of median nerve 16 . Proper palmar digital artery

Identify the following parts

Lateral aspect of right hand Relations of first dorsal interosseous, first lumbrical and adductor pollicis muscles The fascia has been removed from the muscles. 1 . Position of metacarpophalangeal joint of index finger 2 . Lumbrical muscle I 3 . Branch dorsal metacarpal artery I (dorsal digital artery) 4 . Dorsal digital nerves of radial nerve 5 . Dorsal interosseous muscle I 6 . Adductor pollicis muscle (transverse head) 7 . Branch dorsal metacarpal artery I (dorsal digital artery) 8 . Tributary to cephalic vein 9 . Abductor pollicis brevis muscle 10 . Metacarpal I 11 . Extensor pollicis brevis muscle (tendon of insertion) 12 . Extensor pollicis longus muscle (tendon of insertion) 13 . Position of metacarpophalangeal joint of thumb 14 . Extensor expansion 15 . Proper palmar digital nerve of median nerve 16 . Proper palmar digital artery

Identify the following parts

Volar aspect of right hand Branches of deep volar arch Nutrient, perforating and muscular branches of the deep volar arch have been exposed by removing parts of the dorsal interosseous muscles. Other branches of the arch have been shown in previous views. 1 . Deep palmar arch 2 . Anterior metacarpal artery (cutoff) 3 . Muscular branch of deep palmar arch (to dorsal interosseous muscle II) 4 . Left pointer: Princeps pollicis artery Right pointer: Digital branch of radial artery 5 . Muscular branch of deep palmar arch (to dorsal interosseus muscle I) 6 . Perforating branch 7 . Articular branch of deep palmar arch 8 . Metacarpotrapezial joint capsule 9 . Tubercle of trapezium bone 10 . Radial artery 11 . Flexor carpi radialis muscle (tendon of insertion) 12 . Anterior carpal branch radial artery 13 . Radius 14 . Anterior interosseous artery 15 . Left pointer: Distal radioulnar joint capsule Right pointer: Ulna 16 . Anterior radiocarpal ligament 17 . Flexor carpi ulnaris muscle (insertion) 18 . Right pointer: Pisohamate ligament Left pointer: Pisometacarpal ligament 19 . Articular branches of ulnar artery 20 . Recurrent carpal branch of deep palmar arch 21 . Perforating branches 22 . Deep anterior branch ulnar artery (cut off) 23 . Nutrient branches of deep palmar arch to metacarpals 24 . Metacarpal V 25 . Dorsal interosseous muscles II-IV (partially resected)

Identify the following parts

Volar aspect of right hand Branches of deep volar arch Nutrient, perforating and muscular branches of the deep volar arch have been exposed by removing parts of the dorsal interosseous muscles. Other branches of the arch have been shown in previous views. 1 . Deep palmar arch 2 . Anterior metacarpal artery (cutoff) 3 . Muscular branch of deep palmar arch (to dorsal interosseous muscle II) 4 . Left pointer: Princeps pollicis artery Right pointer: Digital branch of radial artery 5 . Muscular branch of deep palmar arch (to dorsal interosseus muscle I) 6 . Perforating branch 7 . Articular branch of deep palmar arch 8 . Metacarpotrapezial joint capsule 9 . Tubercle of trapezium bone 10 . Radial artery 11 . Flexor carpi radialis muscle (tendon of insertion) 12 . Anterior carpal branch radial artery 13 . Radius 14 . Anterior interosseous artery 15 . Left pointer: Distal radioulnar joint capsule Right pointer: Ulna 16 . Anterior radiocarpal ligament 17 . Flexor carpi ulnaris muscle (insertion) 18 . Right pointer: Pisohamate ligament Left pointer: Pisometacarpal ligament 19 . Articular branches of ulnar artery 20 . Recurrent carpal branch of deep palmar arch 21 . Perforating branches 22 . Deep anterior branch ulnar artery (cut off) 23 . Nutrient branches of deep palmar arch to metacarpals 24 . Metacarpal V 25 . Dorsal interosseous muscles II-IV (partially resected)

Identify the following parts

Volar aspect of right hand Dorsal interosseous muscles The volar interossei have been removed but the areas of origin (4) and tendons of insertion (7) of these muscles are indicated. 1 . Deep palmar arch 2 . Muscular branches of ulnar nerve (to dorsal interossei) 3 . Dorsal interosseous muscles I-IV 4 . Areas of origin of anterior interosseous muscles 5 . Area of origin of adductor pollicis muscle (transverse head) 6 . Lumbrical muscle I 7 . Anterior interosseous muscles (tendons of insertion) 8 . Lumbrical muscles II-IV 9 . Muscle with morphological similarity to anterior interossei (see 105-3) 10 . Metacarpal I 11 . Princeps pollicis artery 12 . Radial artery 13 . Flexor carpi radialis muscle (tendon of insertion) 14 . Superficial anterior branch radial artery 15 . Tubercle of trapezium bone 16 . Hamulus of hamate bone 17 . Left pointer: Deep branch of ulnar nerve Right pointer: Articular branch of deep branch of ulnar nerve 18 . Deep anterior branch ulnar artery (cut off) 19 . Anterior metacarpal artery

Identify the following parts

Volar aspect of right hand Dorsal interosseous muscles The volar interossei have been removed but the areas of origin (4) and tendons of insertion (7) of these muscles are indicated. 1 . Deep palmar arch 2 . Muscular branches of ulnar nerve (to dorsal interossei) 3 . Dorsal interosseous muscles I-IV 4 . Areas of origin of anterior interosseous muscles 5 . Area of origin of adductor pollicis muscle (transverse head) 6 . Lumbrical muscle I 7 . Anterior interosseous muscles (tendons of insertion) 8 . Lumbrical muscles II-IV 9 . Muscle with morphological similarity to anterior interossei (see 105-3) 10 . Metacarpal I 11 . Princeps pollicis artery 12 . Radial artery 13 . Flexor carpi radialis muscle (tendon of insertion) 14 . Superficial anterior branch radial artery 15 . Tubercle of trapezium bone 16 . Hamulus of hamate bone 17 . Left pointer: Deep branch of ulnar nerve Right pointer: Articular branch of deep branch of ulnar nerve 18 . Deep anterior branch ulnar artery (cut off) 19 . Anterior metacarpal artery

Identify the following parts

Volar aspect of right hand Volar and dorsal interosseous muscles The adductor pollicis muscle has been removed. The volar interosseous fascia and transverse capsular ligaments have been cut away to display the interosseous muscles. The first dorsal interosseous muscle has been detached from its origin on the first metacarpal bone. An independent, small muscle (8) remains attached to the first metacarpal. This corresponds in origin and insertion with the regular volar interosseous muscles. 1 . Lumbrical muscle I 2 . Head of metacarpal II 3 . Metacarpophalangeal joint capsule 4 . Articular branches of deep branch of ulnar nerve 5 . Dorsal interosseus muscle II 6 . Anterior interosseous muscle I 7 . Dorsal interosseous muscle I 8 . Muscle with origin and insertion corresponding to that of other anterior interossei 9 . Metacarpal I 10 . Princeps pollicis artery 11 . Radial artery 12 . Area of insertion of flexor carpi radialis muscle 13 . Metacarpotrapezial joint capsule 14 . Transverse carpal ligament (cut) 15 . Upper pointer: Area of origin of flexor pollicis brevis muscle (deep head) Lower pointer: Origin of adductor pollicis muscle (oblique head) 16 . Hamulus of hamate bone 17 . Deep branch of ulnar nerve (branches to interosseous muscles visible but not labeled) 18 . Deep palmar arch 19 . Deep anterior branch ulnar artery (cut off) 20 . Anterior metacarpal artery 21 . Dorsal interosseous muscle III 22 . Anterior interosseous muscle II 23 . Dorsal interosseous muscle IV 24 . Left pointer: Anterior interosseous muscle III Right pointer: Articular branch of deep branch of ulnar nerve 25 . Anterior accessory ligament

Identify the following parts

Volar aspect of right hand Volar and dorsal interosseous muscles The adductor pollicis muscle has been removed. The volar interosseous fascia and transverse capsular ligaments have been cut away to display the interosseous muscles. The first dorsal interosseous muscle has been detached from its origin on the first metacarpal bone. An independent, small muscle (8) remains attached to the first metacarpal. This corresponds in origin and insertion with the regular volar interosseous muscles. 1 . Lumbrical muscle I 2 . Head of metacarpal II 3 . Metacarpophalangeal joint capsule 4 . Articular branches of deep branch of ulnar nerve 5 . Dorsal interosseus muscle II 6 . Anterior interosseous muscle I 7 . Dorsal interosseous muscle I 8 . Muscle with origin and insertion corresponding to that of other anterior interossei 9 . Metacarpal I 10 . Princeps pollicis artery 11 . Radial artery 12 . Area of insertion of flexor carpi radialis muscle 13 . Metacarpotrapezial joint capsule 14 . Transverse carpal ligament (cut) 15 . Upper pointer: Area of origin of flexor pollicis brevis muscle (deep head) Lower pointer: Origin of adductor pollicis muscle (oblique head) 16 . Hamulus of hamate bone 17 . Deep branch of ulnar nerve (branches to interosseous muscles visible but not labeled) 18 . Deep palmar arch 19 . Deep anterior branch ulnar artery (cut off) 20 . Anterior metacarpal artery 21 . Dorsal interosseous muscle III 22 . Anterior interosseous muscle II 23 . Dorsal interosseous muscle IV 24 . Left pointer: Anterior interosseous muscle III Right pointer: Articular branch of deep branch of ulnar nerve 25 . Anterior accessory ligament

Identify the following parts

Volar aspect of right hand Nerve supply to oblique head of adductor pollicis and deep head of flexor pollicis brevis muscles The transverse head (22) of the adductor pollicis has been cut close to its origin from the shaft of the third metacarpal bone. The oblique head (6) has been divided and dissected to show the course of branches from the deep ramus of the ulnar nerve. 1 . Deep transverse metacarpal ligament 2 . Lumbrical muscle I 3 . Anterior interosseous muscle I 4 . Anterior interosseous fascia 5 . Dorsal interosseous muscle I 6 . Adductor pollicis muscle (oblique head, divided) 7 . Muscle fascicle with origin from shaft of first metacarpal and insertion on base of first phalanx (independent of deep head of flexor pollicis brevis and comparable to anterior interosseous muscles; frequently referred to as first anterior interosseous muscle) 8 . Princeps pollicis artery 9 . Flexor pollicis brevis muscle (deep head, dissected) 10 . Muscular branch of ulnar nerve (to dorsal interosseous muscle I) 11 . Muscular branch of ulnar nerve (to oblique head of adductor pollicis muscle and deep part of flexor pollicis brevis muscle) 12 . Metacarpotrapezial joint capsule 13 . Transverse carpal ligament 14 . Anterior carpal rete 15 . Flexor carpi ulnaris muscle (tendon of insertion) 16 . Pisiform bone (covered by ligament) 17 . Muscular branch ulnar artery 18 . Pisometacarpal ligament 19 . Branch perforans (from recurrent carpal branch of deep anterior arch) 20 . Deep branch of ulnar nerve 21 . Deep palmar arch 22 . Adductor pollicis muscle (transverse head, near origin) 23 . Upper pointer: Dorsal interosseous muscle III Lower pointer: Anterior interosseous muscle II 24 . Metacarpal V 25 . Anterior accessory ligament 26 . Digital fibrous sheath (transected, flexor tendons removed)

Identify the following parts

Volar aspect of right hand Nerve supply to oblique head of adductor pollicis and deep head of flexor pollicis brevis muscles The transverse head (22) of the adductor pollicis has been cut close to its origin from the shaft of the third metacarpal bone. The oblique head (6) has been divided and dissected to show the course of branches from the deep ramus of the ulnar nerve. 1 . Deep transverse metacarpal ligament 2 . Lumbrical muscle I 3 . Anterior interosseous muscle I 4 . Anterior interosseous fascia 5 . Dorsal interosseous muscle I 6 . Adductor pollicis muscle (oblique head, divided) 7 . Muscle fascicle with origin from shaft of first metacarpal and insertion on base of first phalanx (independent of deep head of flexor pollicis brevis and comparable to anterior interosseous muscles; frequently referred to as first anterior interosseous muscle) 8 . Princeps pollicis artery 9 . Flexor pollicis brevis muscle (deep head, dissected) 10 . Muscular branch of ulnar nerve (to dorsal interosseous muscle I) 11 . Muscular branch of ulnar nerve (to oblique head of adductor pollicis muscle and deep part of flexor pollicis brevis muscle) 12 . Metacarpotrapezial joint capsule 13 . Transverse carpal ligament 14 . Anterior carpal rete 15 . Flexor carpi ulnaris muscle (tendon of insertion) 16 . Pisiform bone (covered by ligament) 17 . Muscular branch ulnar artery 18 . Pisometacarpal ligament 19 . Branch perforans (from recurrent carpal branch of deep anterior arch) 20 . Deep branch of ulnar nerve 21 . Deep palmar arch 22 . Adductor pollicis muscle (transverse head, near origin) 23 . Upper pointer: Dorsal interosseous muscle III Lower pointer: Anterior interosseous muscle II 24 . Metacarpal V 25 . Anterior accessory ligament 26 . Digital fibrous sheath (transected, flexor tendons removed)

Identify the following parts

Volar aspect of right hand Nerve supply to transverse head of adductor pollicis muscle The muscle has been cut and dissected to show the intramuscular course of branches of the deep branch of the ulnar nerve. 1 . Muscular branches of ulnar nerve (upper pointer, to dorsal interosseous muscle I; lower pointer, to flexor pollicis brevis muscle) 2 . Muscular branches of ulnar nerve (to adductor pollicis muscle) 3 . Deep transverse metacarpal ligament 4 . Adductor pollicis muscle (transverse head) 5 . Lumbrical muscle I 6 . Dorsal interosseous muscle I 7 . Abductor pollicis brevis muscle (area of insertion) 8 . Metacarpal I 9 . Flexor pollicis brevis muscle (deep head) 10 . Adductor pollicis muscle (oblique head) 11 . Radiocarpal ligament (pointer on capitate bone covered by ligament) 12 . Flexor carpi radialis muscle (tendon of insertion) 13 . Pisiform bone 14 . Deep branch of ulnar nerve 15 . Deep palmar arch 16 . Opponens digiti minimi muscle (dissected and retracted medially) 17 . Anterior metacarpal arteries 18 . Dorsal interosseous muscle III 19 . Anterior interosseous muscle II 20 . Left pointer: Dorsal interosseous muscle IV Right pointer: Anterior interosseous muscle III

Identify the following parts

Volar aspect of right hand Nerve supply to transverse head of adductor pollicis muscle The muscle has been cut and dissected to show the intramuscular course of branches of the deep branch of the ulnar nerve. 1 . Muscular branches of ulnar nerve (upper pointer, to dorsal interosseous muscle I; lower pointer, to flexor pollicis brevis muscle) 2 . Muscular branches of ulnar nerve (to adductor pollicis muscle) 3 . Deep transverse metacarpal ligament 4 . Adductor pollicis muscle (transverse head) 5 . Lumbrical muscle I 6 . Dorsal interosseous muscle I 7 . Abductor pollicis brevis muscle (area of insertion) 8 . Metacarpal I 9 . Flexor pollicis brevis muscle (deep head) 10 . Adductor pollicis muscle (oblique head) 11 . Radiocarpal ligament (pointer on capitate bone covered by ligament) 12 . Flexor carpi radialis muscle (tendon of insertion) 13 . Pisiform bone 14 . Deep branch of ulnar nerve 15 . Deep palmar arch 16 . Opponens digiti minimi muscle (dissected and retracted medially) 17 . Anterior metacarpal arteries 18 . Dorsal interosseous muscle III 19 . Anterior interosseous muscle II 20 . Left pointer: Dorsal interosseous muscle IV Right pointer: Anterior interosseous muscle III

Identify the following parts

Volar aspect of right hand Thenar muscles; deep volar arch; deep branch of ulnar nerve The volar interosseous fascia has been partially cut away. 1 . Tendon of digital sheath II 2 . Deep transverse metacarpal ligament 3 . Muscular branch of ulnar nerve (to lumbrical muscle II) 4 . Lumbrical muscle II 5 . Anterior interosseous fascia (partially resected) 6 . Lumbrical muscle III 7 . Lumbrical muscle IV 8 . Lumbrical muscle I 9 . Flexor pollicis longus muscle (tendon of insertion) 10 . Dorsal interosseous muscle I 11 . Abductor pollicis brevis muscle (insertion) 12 . Flexor pollicis brevis muscle (area of insertion of superficial head) 13 . Adductor pollicis muscle (transverse head) 14 . Opponens pollicis muscle 15 . Flexor pollicis brevis muscle (deep head) 16 . Adductor pollicis muscle (oblique head) 17 . Metacarpotrapezial joint capsule 18 . Transverse carpal ligament 19 . Volar carpal rete 20 . Superficial anterior branch radial artery 21 . Ulnar artery 22 . Muscular branch ulnar artery (in position usually occupied by deep anterior branch ulnar artery) 23 . Deep branch of ulnar nerve 24 . Muscular branches of ulnar nerve (to opponens digiti minimi muscle) 25 . Opponens digiti minimi muscle (retracted medially) 26 . Deep anterior branch ulnar artery (anomalous origin more distal than usual see 22 above) 27 . Fascia separating hypothenar from interosseous muscles 28 . Left pointer: Deep palmar arch Right pointer: Deep anterior venous arch 29 . Anterior metacarpal artery IV 30 . Interosseous muscles

Identify the following parts

Volar aspect of right hand Thenar muscles; deep volar arch; deep branch of ulnar nerve The volar interosseous fascia has been partially cut away. 1 . Tendon of digital sheath II 2 . Deep transverse metacarpal ligament 3 . Muscular branch of ulnar nerve (to lumbrical muscle II) 4 . Lumbrical muscle II 5 . Anterior interosseous fascia (partially resected) 6 . Lumbrical muscle III 7 . Lumbrical muscle IV 8 . Lumbrical muscle I 9 . Flexor pollicis longus muscle (tendon of insertion) 10 . Dorsal interosseous muscle I 11 . Abductor pollicis brevis muscle (insertion) 12 . Flexor pollicis brevis muscle (area of insertion of superficial head) 13 . Adductor pollicis muscle (transverse head) 14 . Opponens pollicis muscle 15 . Flexor pollicis brevis muscle (deep head) 16 . Adductor pollicis muscle (oblique head) 17 . Metacarpotrapezial joint capsule 18 . Transverse carpal ligament 19 . Volar carpal rete 20 . Superficial anterior branch radial artery 21 . Ulnar artery 22 . Muscular branch ulnar artery (in position usually occupied by deep anterior branch ulnar artery) 23 . Deep branch of ulnar nerve 24 . Muscular branches of ulnar nerve (to opponens digiti minimi muscle) 25 . Opponens digiti minimi muscle (retracted medially) 26 . Deep anterior branch ulnar artery (anomalous origin more distal than usual see 22 above) 27 . Fascia separating hypothenar from interosseous muscles 28 . Left pointer: Deep palmar arch Right pointer: Deep anterior venous arch 29 . Anterior metacarpal artery IV 30 . Interosseous muscles

Identify the following parts

Volar aspect of right hand Thenar muscles The second metacarpal bone has been transected and the index finger removed. The tendon of the flexor pollicis longus muscle (9) has been cut off. The abductor pollicis brevis (10) has been partially resected. The remaining thenar muscles have been separated. The palmar aponeurosis has been cut away and the flexor tendons have been removed from the carpal canal (16). 1 . Adductor pollicis muscle (oblique head) 2 . Anterior common digital artery 3 . Metacarpal II (cut) 4 . Anterior radial index artery 5 . Adductor pollicis muscle (transverse head) 6 . Dorsal interosseous muscle 7 . Lumbrical muscle II 8 . Ligament of digital sheath 9 . Flexor pollicis longus muscle (tendon of insertion) 10 . Abductor pollicis brevis muscle (divided and partially removed) 11 . Flexor pollicis brevis muscle (left pointer superficial head; right pointer deep head) 12 . Opponens pollicis muscle 13 . Groove for tendon of flexor pollicis longus muscle 14 . Abductor pollicis longus muscle (tendon of insertion) 15 . Flexor carpi radialis muscle (tendon of insertion) 16 . Carpal tunnel 17 . Anterior carpal ligament 18 . Ulnar artery and nerve 19 . Transverse carpal ligament 20 . Flexor digiti minimi muscle 21 . Left pointer: Deep branch of ulnar nerve Right pointer: Deep anterior branch ulnar artery 22 . Anterior interosseous fascia 23 . Anterior common digital artery 24 . Fascial septum between palmar aponeurosis and anterior interosseous fascia 25 . Transverse fascicle of palmar aponeurosis

Identify the following parts

Volar aspect of right hand Thenar muscles The second metacarpal bone has been transected and the index finger removed. The tendon of the flexor pollicis longus muscle (9) has been cut off. The abductor pollicis brevis (10) has been partially resected. The remaining thenar muscles have been separated. The palmar aponeurosis has been cut away and the flexor tendons have been removed from the carpal canal (16). 1 . Adductor pollicis muscle (oblique head) 2 . Anterior common digital artery 3 . Metacarpal II (cut) 4 . Anterior radial index artery 5 . Adductor pollicis muscle (transverse head) 6 . Dorsal interosseous muscle 7 . Lumbrical muscle II 8 . Ligament of digital sheath 9 . Flexor pollicis longus muscle (tendon of insertion) 10 . Abductor pollicis brevis muscle (divided and partially removed) 11 . Flexor pollicis brevis muscle (left pointer superficial head; right pointer deep head) 12 . Opponens pollicis muscle 13 . Groove for tendon of flexor pollicis longus muscle 14 . Abductor pollicis longus muscle (tendon of insertion) 15 . Flexor carpi radialis muscle (tendon of insertion) 16 . Carpal tunnel 17 . Anterior carpal ligament 18 . Ulnar artery and nerve 19 . Transverse carpal ligament 20 . Flexor digiti minimi muscle 21 . Left pointer: Deep branch of ulnar nerve Right pointer: Deep anterior branch ulnar artery 22 . Anterior interosseous fascia 23 . Anterior common digital artery 24 . Fascial septum between palmar aponeurosis and anterior interosseous fascia 25 . Transverse fascicle of palmar aponeurosis

Identify the following parts

Volar aspect of right hand Nerve supply to third and fourth lumbrical muscles and opponens digiti quinti muscle The flexor tendons and lumbrical muscles have been retracted distally. The opponens digiti quinti muscle has been dissected. 1 . Sheath of common tendon of flexor muscles (opened, tendons and lumbrical muscles reflected distally) 2 . Lumbrical muscle III 3 . Lumbrical muscle IV 4 . Flexor digitorum profundus muscle (tendon to fifth finger) 5 . Lumbrical muscle I (cut off) 6 . Adductor pollicis muscle 7 . Flexor pollicis brevis muscle (deep head) 8 . Metacarpotrapezial joint capsule 9 . Transverse carpal ligament 10 . Carpal tunnel 11 . Branches of of ulnar nerve 12 . Ulnar artery 13 . Muscular branch ulnar artery (in position usually occupied by deep anterior branch ulnar artery) 14 . Deep branch of ulnar nerve 15 . Flexor and abductor digiti minimi muscles (area of origin) 16 . Muscular branch of ulnar nerve (to opponens digiti minimi muscle) 17 . Opponens digiti minimi muscle 18 . Deep anterior branch ulnar artery (aberrant origin more distal than usual) 19 . Anterior interosseous fascia 20 . Muscular branch of ulnar nerve (to Iumbrical muscle III) 21 . Proper palmar digital artery 22 . Muscular branch of ulnar nerve (to lumbrical muscle IV) 23 . Flexor and abductor digiti minimi muscles (area of insertion) 24 . Tendon of digital sheath V (opened)

Identify the following parts

Volar aspect of right hand Nerve supply to third and fourth lumbrical muscles and opponens digiti quinti muscle The flexor tendons and lumbrical muscles have been retracted distally. The opponens digiti quinti muscle has been dissected. 1 . Sheath of common tendon of flexor muscles (opened, tendons and lumbrical muscles reflected distally) 2 . Lumbrical muscle III 3 . Lumbrical muscle IV 4 . Flexor digitorum profundus muscle (tendon to fifth finger) 5 . Lumbrical muscle I (cut off) 6 . Adductor pollicis muscle 7 . Flexor pollicis brevis muscle (deep head) 8 . Metacarpotrapezial joint capsule 9 . Transverse carpal ligament 10 . Carpal tunnel 11 . Branches of of ulnar nerve 12 . Ulnar artery 13 . Muscular branch ulnar artery (in position usually occupied by deep anterior branch ulnar artery) 14 . Deep branch of ulnar nerve 15 . Flexor and abductor digiti minimi muscles (area of origin) 16 . Muscular branch of ulnar nerve (to opponens digiti minimi muscle) 17 . Opponens digiti minimi muscle 18 . Deep anterior branch ulnar artery (aberrant origin more distal than usual) 19 . Anterior interosseous fascia 20 . Muscular branch of ulnar nerve (to Iumbrical muscle III) 21 . Proper palmar digital artery 22 . Muscular branch of ulnar nerve (to lumbrical muscle IV) 23 . Flexor and abductor digiti minimi muscles (area of insertion) 24 . Tendon of digital sheath V (opened)

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Volar aspect of right hand Nerve supply to second lumbrical muscle, close-up view The flexor tendons and lumbrical muscles of the third, fourth and fifth fingers have been retracted medially. The second lumbrical muscle (5) has been dissected. Its nerve (4) in this instance is a branch of the deep volar branch of the ulnar nerve which reaches the muscle after passing through the adductor pollicis muscle. Usually the second lumbrical receives its nerve supply from the median nerve. 1 . Lumbrical muscle I 2 . Flexor digitorum superficialis (tendon to index finger) 3 . Deep transverse metacarpal ligament 4 . Muscular branch of ulnar nerve (to lumbrical muscle II) 5 . Lumbrical muscle II 6 . Flexor digitorum superficialis (tendon to third finger) 7 . Lumbrical muscle III (retracted medially) 8 . Flexor digitorum superficialis (tendon to fourth finger) 9 . Lumbrical muscle IV (upper pointer on accessory muscular slip to ulnar side of fourth finger) 10 . Adductor pollicis muscle (transverse head) 11 . Groove for tendon of flexor pollicis longus muscle 12 . Muscular branches of median nerve (to lumbrical muscle I) 13 . Muscular branch of ulnar nerve (to flexor pollicis brevis muscle) 14 . Fascia over adductor pollicis muscle (partially resected) 15 . Branches of anterior metacarpal artery III 16 . Anterior interosseous fascia 17 . Ulnar artery 18 . Deep anterior branch ulnar artery 19 . Anterior metacarpal artery IV 20 . Muscular branch of ulnar nerve (to lumbrical muscle III) 21 . Opponens digiti minimi muscle 22 . Proper palmar digital artery

Identify the following parts

Volar aspect of right hand Nerve supply to second lumbrical muscle, close-up view The flexor tendons and lumbrical muscles of the third, fourth and fifth fingers have been retracted medially. The second lumbrical muscle (5) has been dissected. Its nerve (4) in this instance is a branch of the deep volar branch of the ulnar nerve which reaches the muscle after passing through the adductor pollicis muscle. Usually the second lumbrical receives its nerve supply from the median nerve. 1 . Lumbrical muscle I 2 . Flexor digitorum superficialis (tendon to index finger) 3 . Deep transverse metacarpal ligament 4 . Muscular branch of ulnar nerve (to lumbrical muscle II) 5 . Lumbrical muscle II 6 . Flexor digitorum superficialis (tendon to third finger) 7 . Lumbrical muscle III (retracted medially) 8 . Flexor digitorum superficialis (tendon to fourth finger) 9 . Lumbrical muscle IV (upper pointer on accessory muscular slip to ulnar side of fourth finger) 10 . Adductor pollicis muscle (transverse head) 11 . Groove for tendon of flexor pollicis longus muscle 12 . Muscular branches of median nerve (to lumbrical muscle I) 13 . Muscular branch of ulnar nerve (to flexor pollicis brevis muscle) 14 . Fascia over adductor pollicis muscle (partially resected) 15 . Branches of anterior metacarpal artery III 16 . Anterior interosseous fascia 17 . Ulnar artery 18 . Deep anterior branch ulnar artery 19 . Anterior metacarpal artery IV 20 . Muscular branch of ulnar nerve (to lumbrical muscle III) 21 . Opponens digiti minimi muscle 22 . Proper palmar digital artery

Identify the following parts

Volar aspect of right hand Flexor tendons reflected from carpal canal; volar interosseous fascia The posterior walls of the common synovial sheath (18) and the sheath of the flexor pollicis longus (14) have been preserved within the carpal canal. These sheaths appear to be continuous in this dissection. However, at a time when both sheaths were intact, air injected into one did not pass into the other. A prominent ridge (16) marks the line of attachment of the mesotendon within the common sheath. 1 . Flexor digitorum superficialis (tendon to index finger) 2 . Flexor digitorum profundus muscle (tendon to index finger) 3 . Flexor pollicis longus muscle (tendon of insertion) 4 . Area of insertion of abductor pollicis brevis muscle and flexor pollicis brevis muscle (superficial head) 5 . Lumbrical muscle I (branches of median nerve visible as they enter muscle) 6 . Adductor pollicis muscle 7 . Flexor pollicis brevis muscle (deep head) 8 . Muscle slip originating with flexor pollicis brevis muscle and inserting with opponens pollicis muscle 9 . Opponens pollicis muscle (area of insertion) 10 . Carpometacarpal joint capsule 11 . Opponens pollicis muscle (remnant of proximal part of muscle) 12 . Transverse carpal ligament 13 . Flexor carpi radialis muscle (tendon of insertion) 14 . Tendon sheath of flexor pollicis longus muscle (posterior wall exposed by removing tendon) 15 . Radial artery 16 . Cut edge of mesotendon of flexor digitorum muscles 17 . Fascia covering pronator quadratus muscle 18 . Sheath of common tendon of flexor muscles (posterior wall exposed by reflecting tendons) 19 . Ulnar artery and nerve 20 . Flexor carpi ulnaris muscle (insertion into pisiform bone) 21 . Right pointer: Muscular branch ulnar artery (in usual position of deep anterior branch ulnar artery) Left pointer: Deep branch of ulnar nerve 22 . Upper pointer: Fascia of adductor pollicis muscle Lower pointer: Deep anterior branch ulnar artery (aberrant position, see 21 above) 23 . Opponens digiti minimi muscle 24 . Anterior interosseus fascia 25 . Muscular branch of ulnar nerve (to lumbrical muscle III) 26 . Flexor digiti minimi muscle 27 . Sheath of common tendon of flexor muscles (distal limit on deep aspect of reflected tendons) 28 . Abductor digiti minimi muscle 29 . Flexor digitorum profundus muscle (deep surfaces of tendons reflected distally)

Identify the following parts

Volar aspect of right hand Flexor tendons reflected from carpal canal; volar interosseous fascia The posterior walls of the common synovial sheath (18) and the sheath of the flexor pollicis longus (14) have been preserved within the carpal canal. These sheaths appear to be continuous in this dissection. However, at a time when both sheaths were intact, air injected into one did not pass into the other. A prominent ridge (16) marks the line of attachment of the mesotendon within the common sheath. 1 . Flexor digitorum superficialis (tendon to index finger) 2 . Flexor digitorum profundus muscle (tendon to index finger) 3 . Flexor pollicis longus muscle (tendon of insertion) 4 . Area of insertion of abductor pollicis brevis muscle and flexor pollicis brevis muscle (superficial head) 5 . Lumbrical muscle I (branches of median nerve visible as they enter muscle) 6 . Adductor pollicis muscle 7 . Flexor pollicis brevis muscle (deep head) 8 . Muscle slip originating with flexor pollicis brevis muscle and inserting with opponens pollicis muscle 9 . Opponens pollicis muscle (area of insertion) 10 . Carpometacarpal joint capsule 11 . Opponens pollicis muscle (remnant of proximal part of muscle) 12 . Transverse carpal ligament 13 . Flexor carpi radialis muscle (tendon of insertion) 14 . Tendon sheath of flexor pollicis longus muscle (posterior wall exposed by removing tendon) 15 . Radial artery 16 . Cut edge of mesotendon of flexor digitorum muscles 17 . Fascia covering pronator quadratus muscle 18 . Sheath of common tendon of flexor muscles (posterior wall exposed by reflecting tendons) 19 . Ulnar artery and nerve 20 . Flexor carpi ulnaris muscle (insertion into pisiform bone) 21 . Right pointer: Muscular branch ulnar artery (in usual position of deep anterior branch ulnar artery) Left pointer: Deep branch of ulnar nerve 22 . Upper pointer: Fascia of adductor pollicis muscle Lower pointer: Deep anterior branch ulnar artery (aberrant position, see 21 above) 23 . Opponens digiti minimi muscle 24 . Anterior interosseus fascia 25 . Muscular branch of ulnar nerve (to lumbrical muscle III) 26 . Flexor digiti minimi muscle 27 . Sheath of common tendon of flexor muscles (distal limit on deep aspect of reflected tendons) 28 . Abductor digiti minimi muscle 29 . Flexor digitorum profundus muscle (deep surfaces of tendons reflected distally)

Identify the following parts

Volar aspect of right hand Insertions of flexor tendons The digital tendon sheaths have been opened and the flexor tendons elevated. The hand is viewed somewhat from its medial aspect. 1 . Heavy fascial bands extending along sides of fingers 2 . Flexor digitorum profundus muscle (tendon of insertion) 3 . Flexor pollicis longus muscle (insertion) 4 . Proximal limit of synovial sheath of third finger 5 . Adductor pollicis muscle (transverse head) 6 . Flexor digitorum superficialis (tendons of insertion) 7 . Flexor pollicis brevis muscle (deep head) 8 . Lumbrical muscles 9 . Flexor digiti minimi muscle 10 . Abductor digiti minimi muscle 11 . Ligament of digital sheath (cut edge) 12 . Vincula longa 13 . Vincula brevia

Identify the following parts

Volar aspect of right hand Insertions of flexor tendons The digital tendon sheaths have been opened and the flexor tendons elevated. The hand is viewed somewhat from its medial aspect. 1 . Heavy fascial bands extending along sides of fingers 2 . Flexor digitorum profundus muscle (tendon of insertion) 3 . Flexor pollicis longus muscle (insertion) 4 . Proximal limit of synovial sheath of third finger 5 . Adductor pollicis muscle (transverse head) 6 . Flexor digitorum superficialis (tendons of insertion) 7 . Flexor pollicis brevis muscle (deep head) 8 . Lumbrical muscles 9 . Flexor digiti minimi muscle 10 . Abductor digiti minimi muscle 11 . Ligament of digital sheath (cut edge) 12 . Vincula longa 13 . Vincula brevia