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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 4.20

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 4.20

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. Tendon m. brachioradialis
6. Flexor pollicis longus m.
7. Tendons mm. extensor carpi radialis brevis and longus
8. Radius
9. Abductor pollicis longus m.
10. Extensor pollicis brevis m.
11. Anterior interosseous a. and v.

12. Extensor digitorum communis m.
13. Extensor pollicis longus m.
14. Antebrachial interosseous membrane
15. Extensor digiti minimi m.
16. Extensor indicis proprius m.
17. Extensor carpi ulnaris m.
18. Ulna
19. Flexor digitorum profundus m.

20. Flexor carpi ulnaris m.
21. Ulnar nerve
22. Ulnar a.
23. Flexor digitorum superficialis m.

The diameter of the forearm is decreasing in size due to a reduction in the bulk of the muscle bellies. In addition, several muscles are now tendinous, and this trend continues as the sections approach the wrist.

It is of some interest that because of the anterolateral position of the extensor group of muscles at the elbow, the radial nerve is carried anterior to the elbow joint and innervates brachioradialis and extensor carpi radialis longus, which are functionally flexors of the forearm. In this section, the tendon of brachioradialis (5) is anterior to the radius and the tendon of extensor carpi radialis longus (7) is lateral to the radius. The deep branch of the radial nerve subsequently moves to the posterior compartment between the superficial and deep extensor muscles.

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