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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 4.21

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 4.21

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. palmaris longus
2. Tendon m. flexor carpi radialis
3. Median nerve
4. Radial a.
5. Cephalic v.
6. Flexor pollicis longus m.

7. Tendon m. brachioradialis
8. Radius
9. Tendons mm. extensores carpi radialis brevis and longus
10. Abductor pollicis longus m.
11. Extensor pollicis brevis m.
12. Tendon m. extensor digitorum communis m.

13. Extensor pollicis longus m.
14. Extensor digitorum communis m. and tendon
15. Anterior interosseous a. and v.
16. Extensor digiti minimi m.
17. Extensor indicis proprius m.
18. Antebrachial interosseous membrane
19. Extensor carpi ulnaris m.
20. Ulna
21. Pronator quadratus m.

22. Flexor carpi ulnaris m.
23. Ulnar a.
24. Ulnar nerve
25. Flexor digitorum superficialis m.

This section passes through pronator quadratus muscle (21), which makes its first appearance. Pronator quadratus is in the deepest layer (fourth) of the muscles of the anterior forearm. It arises from the medial side of the ventral surface of the distal fourth of the ulna. The muscle is inserted on the distal quarter of the ventral surface of the radius by means of an aponeurosis. The muscle lies on the radius and ulna, the ventral surface of the interosseous membrane, and the distal radioulnar joint. The muscle is often separated into superficial and deep portions and it tends to be thicker distally than proximally. This muscle is innervated by the anterior interosseous nerve, which enters its deep surface.

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