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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 4.10

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

Plate 4.10

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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