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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 4.33

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 4.33

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. First lumbrical m.
2. Superficial palmar br., radial a.
3. Abductor pollicis brevis m.
4. Flexor pollicis brevis m.
5. Tendon m. extensor pollicis longus
6. First metacarpal
7. Tendon m. extensor pollicis brevis

8. Tendon m. extensor pollicis longus
9. Adductor pollicis m., transverse head
10. Dorsal Interosseous m.
11. Palmar metacarpal a.
12. Superficial v. of hand
13. Second metacarpal
14. Adductor pollicis m., oblique head

15. Dorsal interosseous m.
16. Third metacarpal
17. Dorsal interosseous m.
18. Fourth metacarpal
19. Superficial v. of hand
20. Palmar interosseous m.
21. Dorsal interosseous m.

22. Palmar metacarpal a.
23. Palmar interosseous m.
24. Fifth metacarpal
25. Tendons m. flexor digitorum profundus and associated lumbrical mm.
26. Opponens digiti minimi m.
27. Tendons m. flexor digitorum superficialis
28. Abductor digiti minimi m.
29. Palmar aponeurosis
30. Palmar aponeurosis
31. Median nerve.

This section passes through the distal ends of the thenar (3, 4) and hypothenar (26, 28) muscles and the first metacarpal bone (6). Note the four lumbrical muscles (25). Palmar metacarpal arteries (11, 22) and superficial palmer branches arise from the radial artery.

The palmer metacarpal arteries are three in number, arise from the convexity of the deep arch, and extend distally in the second, third, and fourth interosseous spaces on the interosseous muscles deep to the palmer interosseous fascia They end by uniting with the palmer common digital arteries from the superficial (ulnar) arch. These arteries supply the interosseous muscles and bones and the second, third, and fourth lumbrical muscles. The superficial palmer branch of the radial arises from the distal end of the radial artery at the level of the styloid process of the radius. It perforates the deep layer of the palmer carpal ligament and enters the thenar compartment, passing across the thenar muscles and supplying them. It may join with the superficial branch of the ulnar artery to complete the superficial palmer arch in about one third of cases. It may also terminate in the thenar muscles or continue into the palm, supplying the radial digits without uniting with the superficial palmer arch.

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