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Volar aspect of right hand

Nerve supply to oblique head of adductor pollicis and deep head of flexor pollicis brevis muscles

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Image #104-7
Diagram Image
Legend Image
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)