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 4.4

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. Lateral antebrachial cutaneous nerve 3. Brachialis m.	4. Radial nerve 5. Brachioradialis m 6. Radial collateral a. and posterior antebrachial cutaneous nerve 7. Lateral epicondylar ridge of humerus 8. Triceps brachii, lateral head m. 9. Triceps brachii, medial head m.	10. Humerus 11. Tendon m. biceps brachii 12. Triceps brachii, long head m. 13. Ulnar nerve	14. Superior ulnar collateral a. 15. Basilic v. 16. Medial antebrachial cutaneous nerve 17. Median nerve 18. Brachial a. and v. 19. Biceps brachii m.

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

The lateral epicondylar ridge (7) is well formed in this section. It provides here an attachment for the brachioradialis muscle (5) and for a slip from brachialis (3).

The ulnar nerve (13) will continue a dorsal movement and will ultimately lie behind the medial epicondyle of the humerus.

The median nerve (17), which supplies the flexor forearm muscles, frequently supplies the medial edge of the brachialis muscle (3) when these two structures become topographically related.

The primary nerve supply to the anterior compartment of the arm is the musculocutaneous nerve, now seen as its cutaneous branch, the lateral antebrachial cutaneous nerve (2).

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