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.
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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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