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Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.34

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed


Plate 4.34

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Digital aa. and palmar digital nerve
2. Tendon m. flexor pollicis longus
3. Proximal phalanx
4. First lumbrical m.
5. First metacarpal
6. Sesamoid bone, pollex
7. Tendon m. extensor pollicis longus

8. Adductor pollicis, transverse head m.
9. Tendons long flexor digital mm., first digit
10. First dorsal interosseous m.
11. Palmar metacarpal a., radial a.
12. Second metacarpal
13. First palmar interosseous m.
14. Tendon m. extensor digitorum communis
15. Second dorsal interosseous m.

16. Tendon m. extensor digitorum communis
17. Third metacarpal
18. Adductor pollicis m., transverse head, origin
19. Third dorsal interosseous m.
20. Second lumbrical m.
21. Tendon m. extensor digiti minimi
22. Fourth metacarpal
23. Second palmar interosseous m.
24. Tendon m. flexor digitorum profundus
25. Tendon m. extensor digiti minimi
26. Fourth dorsal interosseous m.

27. Tendon m. extensor digiti minimi
28. Third lumbrical m.
29. Third palmar interosseous m.
30. Fifth metacarpal
31. Fourth lumbrical m.
32. Tendons long flexor digital mm., fourth digit
33. Opponens and abductor digiti minimi mm.
34. Tendon m. flexor digitorum profundus
35. Tendon m. flexor digitorum superficialis
36. Palmar aponeurosis

In this section, the four dorsal (10, 15, 19, 26) and three palmer (13, 23, 29) interosseous muscles are seen. When four palmer interosseous muscles are described the first palmer interosseous muscle is a division or part of flexor pollicis brevis or adductor pollicis. One origin of adductor pollicis (18) from the third metacarpal bone (17) can be seen. These muscles are all usually innervated by the deep palmer branch of the ulnar nerve. It is of some interest that flexor pollicis brevis is also supplied by the recurrent branch of the first palmer digital ramus of the median nerve as well as by the ulnar nerve. In one study, both nerves supplied the muscle in 19 of 29 cases, in five cases by the median alone, and in five cases by the ulnar alone.

All four lumbrical muscles are identified (4, 20, 28, 31). The first and second (4, 20) are usually median nerve innervated and the third and fourth (28, 31) are ulnar nerve innervated.

A sesamoid bone (6) of the thumb is seen.

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