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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 4.30

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 4.30

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. palmaris longus, palmar aponeurosis
2. Flexor pollicis m.
3. Abductor pollicis brevis m.
4. Tendon m. flexor pollicis longus
5. Adductor pollicis m.
6. Opponens pollicis m.

7. Tendon m. extensor pollicis brevis
8. First metacarpal
9. Tendon m. extensor pollicis longus
10. Dorsal interosseous m.
11. Adductor pollicis m.
12. Second metacarpal
13. Palmar metacarpal ligament
14. Dorsal interosseous m.

15. Third metacarpal
16. Dorsal metacarpal ligament
17. Fourth metacarpal
18. Dorsal v. of hand
19. Radial a., deep palmar arch
20. Dorsal v. of hand
21. Dorsal interosseous m.
22. Fifth metacarpal
23. Interosseous m., palmar (volar)

24. Abductor digiti minimi m. and tendons m. flexor digitorum profundus
25. Opponens digiti minimi m.
26. Tendons m. flexor digitorum superficialis
27. Flexor digiti minimi brevis m.
28. Palmaris brevis m.
29. Ulnar a. and nerve
30. Median nerve

This section is distal to the carpal canal. The thenar (2, 5, 6) and hypothenar (24, 25, 27) muscles dominate the medial and lateral palmer surface of the hand. Palmaris longus tendon (1) has begun to expand to form the palmer aponeurosis. The distal edge of palmaris brevis (28) is seen for the last time.

The bases of the metacarpal bones can be seen. Note that the fifth (22), fourth (17), third (15), and second (12) metacarpal bones articulate with each other at their bases and that the first (8) articulates only with the trapezium. The dorsal (16) and palmer (13) metacarpal ligaments are seen.

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