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 4.7

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. Cephalic v. 2. Tendon m. biceps brachii 3. Brachioradialis m.	4. Radial nerve 5. Extensor carpi radialis longus m. (first appearance) 6. Brachialis m. 7. Lateral intermuscular septum 8. Lateral epicondylar ridge of humerus	9. Triceps brachii, lateral head m. 10. Tendon m. triceps brachii and articular capsule of elbow 11. Medial epicondyle of humerus 12. Medial intermuscular septum 13. Ulnar nerve	14. Basilic v. and anastomotic branch 15. Median nerve 16. Brachial a. and v. 17. Lacertus fibrosus (bicipital aponeurosis) and brachialis m. 18. Biceps brachii m. and tendon

This section passes through the medial (11) and lateral (8) epicondyles of the humerus. The medial (12) and lateral (7) intermuscular septa are seen separating the anterior and posterior compartments.

Note the position of brachioradialis (3) and extensor carpi radialis longus (5) muscles anterior to the lateral epicondyle from which they both arise. Because of their position above the elbow joint, these two muscles are functionally flexors but are classified as extensors, in part because they are innervated by the radial nerve (4). Extensor carpi radialis longus muscle (5) is seen for the first time in this section.

Note that the ulnar nerve (13) has almost completed its move dorsal to the humerus where it will lie in the ulnar sulcus, a groove on the dorsal surface of the medial epicondyle.

The tendon of biceps brachii (18) is composed of two parts: the bicipital aponeurosis or lacertus fibrosus (17), which extends medially to join the antebrachial fascia on the ulnar side of the forearm, and a tough band of tendon (2) that descends into the space between brachioradialis (3) and pronator teres (seen in next section) muscles and above the receding brachialis muscle (17), which inserts onto the dorsal half of the bicipital tuberosity of the radius.

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