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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 4.31

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 4.31

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Palmar aponeurosis
2. Abductor pollicis brevis m.
3. Flexor pollicis brevis m.
4. First lumbrical m.
5. Opponens pollicis m.
6. Tendon m. flexor pollicis longus
7. Flexor pollicis brevis m.
8. First metacarpal of pollex

9. Tendon m. extensor pollicis brevis
10. Tendon m. extensor pollicis longus
11. Princeps pollicis a., radial a.
12. Dorsal interosseous m.
13. Adductor pollicis m.
14. Dorsal interosseous m.
15. Second metacarpal
16. Palmar interosseous m.
17. Deep palmar arch, radial a.
18. Dorsal interosseous m.
19. Tendon m. extensor indicis proprius

20. Tendon extensor digitorum
21. Third metacarpal
22. Tendon m. extensor digitorum
23. Palmar interosseous m.
24. Tendon m. extensor digitorum
25. Fourth metacarpal
26. Tendon m. extensor digitorum
27. Ulnar nerve, deep br.
28. Vein, superficial of hand
29. Palmar interosseous m.
30. Deep palmar arch, radial a.
31. Dorsal interosseous m.
32. Fifth metacarpal
33. Vein, superficial dorsal of hand
34. Tendon m. flexor digitorum profundus
35. Deep palmar arch, radial a.

36. Opponens digiti minimi m.
37. Tendons m. flexor digitorum superficialis
38. Abductor digiti minimi m.
39. Ulnar nerve
40. Ulnar a.
41. Palmar aponeurosis
42. Median nerve

In this section, the dorsal and palmer interosseous muscles are seen between the metacarpal bones. The palmer interosseous muscles adduct the fingers toward the axial line or the middle digit, and the dorsal interosseous muscles are abductors of the fingers.

The palmer interosseous muscles arise from the medial side of the first, third, and fourth fingers. The axial line is the middle digit. Each palmer interosseous muscle inserts into the extensor expansion. The dorsal interosseous muscles arise from the first and second, second and third, third and fourth, and fourth and fifth metacarpals and insert into the dorsal expansion.

Various authors give the number of palmer interosseous muscles as either three or four. If the number given is four, then a division of flexor pollicis brevis or adductor pollicis is considered by those authors to be the first palmer interosseous.

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