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Volar aspect of right hand

Flexor tendons reflected from carpal canal; volar interosseous fascia

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Image #104-1
Diagram Image
Legend Image
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)