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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 4.22

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 4.22

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. flexor carpi radialis
2. Median nerve
3. Radial a.
4. Radial nerve, superficial br.
5. Flexor pollicis longus m.

6. Cephalic v.
7. Tendon m. brachioradialis
8. Tendon m. abductor pollicis longus
9. Radius
10. Tendons mm. extensores carpi radialis brevis and longus
11. Extensor pollicis brevis m
12. Antebrachial interosseous membrane
13. Extensor pollicis longus m. and tendon

14. Posterior interosseous a. and v.
15. Tendons m. extensor digitorum communis
16. Extensor indicis proprius m.
17. Tendon m. extensor digiti minimi
18. Pronator quadratus m.
19. Tendon m. extensor carpi ulnaris
20. Ulna
21. Ulnar nerve, dorsal br. of hand
22. Pronator quadratus m.

23. Basilic v.
24. Flexor carpi ulnaris m.
25. Flexor digitorum profundus m.
26. Ulnar nerve
27. Ulnar a.
28. Flexor digitorum superficialis m.
29. Tendon m. palmaris longus

As noted with the previous section, pronator quadratus (18, 22) thickens distally. It is now twice as thick as it was in the preceding section.

The bellies of both the extensor and flexor muscles are increasingly tendinous as they approach the wrist.

The muscle tendons that enter the carpal tunnel or canal usually include four from flexor digitorum superficialis (28), four from flexor digitorum profundus (25), and one from flexor pollicis longus (5). The median nerve (2) will also traverse the carpal canal to supply the thenar muscles and, usually, the first two lumbricals.

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