Volar aspect of right hand

Origins of lumbrical muscles

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Image #103-5

Volar aspect of right hand

Origins of lumbrical muscles

The tendons of the flexor digitorum sublimis (3) have been divided and the proximal parts removed. The common synovial sheath has been removed to expose the origins of the lumbrical muscles from the deep flexor tendons. The digital tendon sheaths have been removed except for that of the fifth finger.

1. Sheath ligament (cut to release enclosed flexor tendons)
2. Deep transverse metacarpal ligament
3. Flexor digitorum superficialis (tendons cut off)
4. Dorsal interosseous muscle I
5. Adductor pollicis muscle
6. Ligament of digital sheath
7. Abductor pollicis brevis muscle
8. Flexor pollicis brevis muscle (deep head)
9. Flexor pollicis longus muscle (tendon of insertion)
10. Muscular slip originating with flexor pollicis brevis muscle and inserting with opponens pollicis muscle
11. Opponens pollicis muscle
12. Abductor pollicis longus muscle (tendons of insertion)
13. Flexor carpi radialis muscle (tendon of insertion)
14. Superficial anterior branch radial artery
15. Flexor carpi ulnaris muscle (tendon of insertion)
16. Ulnar artery
17. Deep surface of carpal tunnel
18. Flexor digitorum profundus muscle
19. Deep branch of ulnar nerve (terminal branch)
20. Opponens digiti minimi muscle
21. Flexor digiti minimi muscle
22. Lumbrical muscles
23. Tendons of flexor digitorum profundus muscle
24. Aberrant slips of lumbrical muscles III-IV