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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 4.3

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 4.3

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Cephalic v.
2. Hematoma, extravasated blood into superficial fascia
3. Brachialis m.

4. Radial nerve
5. Brachioradialis m. (first appearance)
6. Triceps brachii, lateral head m.
7. Medial collateral a. and v.

8. Triceps brachii, medial head m.
9. Triceps brachii, long head m.
10. Humerus

11. Ulnar nerve
12. Basilic v.
13. Superior ulnar collateral a. (first appearance)
14. Median nerve
15. Brachial a. and v.
16. Biceps brachii m.

This section is two below the preceding one (2 cm).

The brachioradialis muscle (5) makes its first appearance in this section. It lies beneath the radial nerve (4). Note the intimate relationship between the radial nerve and the brachialis muscle (3). The radial nerve usually supplies the distolateral portion of the brachialis muscle.

The superior ulnar collateral artery ( 13) is seen for the first time. It is one of six named branches of the brachial artery: deep (profunda) brachial; nutrient artery of the humerus; superior ulnar collateral; inferior ulnar collateral; and the two terminal branches, the radial and ulnar. Numerous unnamed muscular branches are also present.

Brachioradialis (5) belongs to the lateral extensor group of forearm muscles. Because of their anterolateral position at the elbow, both brachioradialis and extensor carpi radialis longus muscles are flexors of the forearm. The radial nerve (4) arises from the posterior cord, proceeds to the dorsal aspect of the arm, and is then carried anterior to the elbow joint because of the position of the superficial extensor group of muscles that it supplies. This also accounts for the spiral course of the nerve in the radial groove on the back of the humerus. The nerve supplies the entire extensor group of muscles in both the arm and forearm.

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