Volar aspect of right hand

Relation of third and fourth lumbrical muscles to synovial sheaths of flexor tendons

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Image #102-1

Volar aspect of right hand

Relation of third and fourth lumbrical muscles to synovial sheaths of flexor tendons

The digital nerves and vessels have been retracted to expose underlying structures. The synovial tendon sheaths have been inflated with air. The common sheath (ulnar bursa, 15) is continuous with the synovial sheath of the fifth finger (21) and in close proximity to, but not continuous with, that of the fourth finger (4).

1. Ligament of digital sheath III
2. Proper palmar digital nerves of median nerve
3. Ligament of digital sheath IV
4. Tendon of digital sheath IV (inflated with air)
5. Lumbrical muscle IV
6. Anterior proper digital arteries
7. Anterior common digital artery
8. Lumbrical muscle III
9. Lumbrical muscle
10. Lumbrical muscle II
11. Anterior common digital artery (to thumb and index finger)
12. Median artery (large)
13. Anastomotic branch of median nerve with ulnar nerve
14. Lobule of fat beneath transverse carpal ligament
15. Sheath of common tendon of flexor muscles (ulnar bursa, inflated with air)
16. Ulnar artery
17. Flexor digitorum superficialis (communication between common synovial sheath and digital sheath obscured in this area by common digital artery)
18. Flexor digiti minimi muscle
19. Abductor digiti minimi muscle
20. Proper palmar digital nerves of ulnar nerve
21. Tendon of digital sheath V
22. Anterior common digital artery
23. Ligament of digital sheath V