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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 4.12

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 4.12

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Radial nerve, superficial br.
2. Radial recurrent a.
3. Ulnar v.
4. Radial nerve, deep br.
5. Extensor carpi radialis longus m.
6. Extensor carpi radialis brevis m.
7. Supinator m.

8. Ulnar a.
9. Extensor digitorum communis m.
10. Extensor carpi ulnaris m.
11. Radial neck
12. Anconeus m.
13. Tendon m. biceps brachii
14. Ulnar tuberosity

15. Brachialis m.
16. Flexor digitorum profundus m.
17. Ulnar nerve
18. Flexor carpi ulnaris m.
19. Flexor digitorum superficialis m.
20. Pronator teres m.

21. Palmaris longus m.
22. Basilic v.
23. Flexor carpi radialis m.
24. Median nerve
25. Pronator teres m.
26. Radial a. and v.
27. Brachioradialis m.

This section passes through the radial neck (11) and the ulnar tuberosity (14). The median nerve (24) supplies all of the muscles of the flexor forearm except for flexor carpi ulnaris (18) and the ulnar half of flexor digitorum profundus (16). These are supplied by the ulnar nerve (17).

The superficial branch of the radial nerve (1) is purely sensory and may be found running under cover of brachioradialis (27) anterior to the elbow joint. It penetrates the forearm and appears on the back of the forearm where its most lateral branches supply the radial part of the thenar eminence. The most medial branch mingles with terminal branches of the ulnar nerve and is called the ulnar anastomotic branch. The deep branch of the radial nerve (4) becomes known as the posterior interosseous nerve when it enters the space between the superficial and deep muscles of the back of the forearm.

The deep branch of the radial nerve supplies the following muscles: extensor carpi radialis brevis (6), supinator (7), extensor digitorum communis (9), extensor digiti minimi, extensor carpi ulnaris ( 10), extensor indicis, extensor pollicis longus, extensor pollicis brevis, and abductor pollicis longus.

The deep branch, after becoming the posterior interosseous nerve, accompanies the posterior interosseous artery running along the posterior interosseous membrane and back of the radius. At the wrist the nerve passes in the groove for extensor digitorum communis and extensor indicis muscles and terminates as sensory branches to the carpal joints.

Brachialis (15) makes its last appearance in this section.

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