Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

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Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.13

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

Upper Left Quadrant	Lower Left Quadrant	Lower Right Quadrant	Upper Right Quadrant
1. Pronator teres 2. Cephalic v. 3. Radial a. 4. Brachioradialis m. 5. Radial recurrent a. 6. Radial nerve, superficial br. 7. Extensor carpi radialis longus m.	8. Median nerve 9. Radial nerve, deep br. 10. Extensor carpi radialis brevis m. 11. Antebrachial fascia 12. Extensor digitorum communis m. 13. Radial neck 14. Tendon m. biceps brachii 15. Radial nerve, dorsal antebrachial cutaneous br. 16. Extensor digiti minimi m. 17. Supinator m. 18. Extensor carpi ulnaris m.	19. Antebrachial interosseous membrane 20. Anconeus m. 21. Ulna 22. Ulnar a. and v. 23. Brachialis m. 24. Flexor digitorum profundus m. 25. Basilic v.	26. Flexor carpi ulnaris m. and ulnar nerve 27. Flexor digitorum superficialis m. 28. Palmaris longus m. 29. Flexor carpi radialis m.

This section passes through the upper forearm near the insertion of biceps brachii muscle (14) onto the radius (13). Note the topographic relationship between biceps (14) and supinator (17) on the radius. Brachialis (23) inserts onto a shallow depression on the ulna (21) just before the coronoid process. It is surmounted centrally by the ulnar artery and vein (22). Brachialis is united to the capsule of the elbow joint (not seen in this section) and is attached also to the ulnar tuberosity, which is distal to this section. In addition, some tendinous bands are attached to the coronoid process of the ulna. Brachialis is innervated by the musculocutaneous nerve in the arm but it may also receive a branch from the radial nerve in the distolateral part of the muscle. A branch of the median nerve frequently supplies the medial side of the brachialis muscle near the elbow joint.

Note the fat filled area between pronator teres muscle (1) and brachioradialis (4). Extensor digiti minimi muscle ( 16) makes its first appearance in this section. It is innervated by the deep branch of the radial nerve (15).

The radial recurrent artery (5) arises from the lateral side of the radial artery (3) just distal to the origin of the radial from the brachial artery. The radial recurrent divides into three branches. The first anastomoses with the radial collateral from the profunda brachii; the second anastomoses with the interosseous recurrent artery from either the posterior interosseous or the common interosseous artery, which arises from the ulnar artery; and the third branch descends with the radial nerve and supplies it. An important function of the radial recurrent artery is to provide a collateral blood supply for the elbow joint.

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