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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 4.8

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 4.8

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. biceps brachii
2. Lateral antebrachial cutaneous nerve
3. Brachioradialis m.
4. Radial nerve

5. Radial collateral a.
6. Extensor carpi radialis brevis m. (first appearance)
7. Extensor carpi radialis longus m.
8. Lateral intermuscular septum
9. Lateral epicondyle of humerus
10. Humerus and articular capsule
11. Articular capsule of elbow

12. Triceps brachii m.
13. Middle collateral a. and olecranon fossa of humerus
14. Tendon m. triceps brachii
15. Triceps brachii m.
16. Ulnar nerve in ulnar sulcus
17. Medial epicondyle of humerus

18. Pronator teres m. (first appearance)
19. Basilic v. and anastomotic branch
20. Inferior ulnar collateral a.
21. Median nerve
22. Brachial a. and w.
23. Bicipital aponeurosis and brachialis m.

This section passes through the lateral (9) and medial (17) epicondyles of the humerus. Note that the ulnar nerve (16) lies in the ulnar sulcus on the posterior side of the medial epicondyle (17). The radial nerve (4) is located between the brachioradialis (3), brachialis (23), and extensor carpi radialis brevis (6) muscles. The radial nerve supplies all three muscles. The primary innervation of brachialis, however, is the musculocutaneous nerve represented at this level by its cutaneous branch, the lateral antebrachial cutaneous nerve (2). The median nerve (21) is steadfast in its position adjacent to the brachial artery and vein (22).

The radial collateral (5) and the middle collateral (13) arteries are seen in this cut. They are branches of the deep brachial artery. These vessels anastomose with the radial recurrent and the interosseous recurrent arteries, respectively. The inferior ulnar collateral artery (20), also a part of the anastomotic network of blood vessels around the elbow, is also seen.

An extensive hematoma is seen in the anterior superficial (fatty) fascia.

Note the origin of extensor carpi radialis brevis (6) (first appearance) and extensor carpi radialis longus (7) from the lateral intermuscular septum (8), which extends from the lower third of the lateral epicondylar ridge (9). Pronator teres (18) is seen for the first time.

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