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 4.10

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. Tendon m. biceps brachii 2. Brachioradialis m. 3. Radial nerve 4. Extensor carpi radiolus longus and brevis mm. 5. Capitulum of humerus and radial recurrent a. and v.	6. Extensor digitorum communis m. (first appearance) 7. Common extensor m. ligament 8. Lateral epicondyle of humerus 9. Anconeus m.	10. Trochlea and olecranon fossa 11. Olecranon process of ulna 12. Subcutaneous olecranon bursa 13. Flexor digitorum profundus m. (first appearance) 14. Ulnar nerve 15. Ulnar collateral ligament 16. Flexor digitorum superficialis m. (first appearance) 17. Coronoid fossa of humerus	18. Articular capsule and brachialis m. 19. Pronator teres m. 20. Basilic v. 21. Median nerve 22. Brachial a. and w. 23. Cephalic v.

This section passes through the medial and lateral (8) epicondyles, the trochlea (10), and the coronoid (17) and olecranon fossae (10). It passes through the olecranon bursa (12) and the anconeus muscle (9).

Extensor digitorum communis (6), flexor digitorum superficialis (16), and flexor digitorum profundus (13) muscles appear for the first time.

Note that the flexor muscles of the forearm have an origin from the medial epicondyle of the humerus and the extensor muscles from the lateral epicondyle. Note also that the extensor and flexor groups are separated by the brachialis muscle (18). In the space between these two groups, the brachial artery terminates in the next section by bifurcating to form the radial and ulnar arteries.

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