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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 4.4

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

Plate 4.4

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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