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 4.1

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. Deltoid tuberosity, humerus 3. Deltoid m. (lost appearance) 4. Humerus 5. Brachialis m.	6. Radial collateral a. 7. Triceps brachii, lateral head	8. Radial nerve 9. Triceps brachii, long head m. 10. Triceps brachii, medial head m. 11. Superficial (fatty) fascia and radial nerve, muscular br. 12. Ulnar nerve	13. Brachial a. 14. Median nerve 15. Medial intermuscular septum 16. Coracobrachialis m. 17. Biceps brachii, short head m. 18. Musculocutaneous nerve 19. Biceps brachii, long head m.

This section passes through the humerus at the distal end of the insertion of the deltoid muscle (3) onto the deltoid tuberosity (2) of the humerus. The deltoid makes its last appearance in this section.

The musculocutaneous nerve lies on the coracobrachialis muscle (16), which it pierced in its course through the upper arm.

The median nerve (14) lies above the brachial artery (13) and the ulnar nerve (12) below. The radial nerve (8) has migrated from its original medial position below (dorsal) the brachial artery (13) to one that is posterior to the humerus and between the medial head (10) and the long (9) and lateral (7) heads of triceps brachii. It continues its lateral migration in subsequent sections.

All of the muscular components of the anterior and posterior compartments are present in this section. The anterior compartment muscles include biceps brachii (17, 19), brachialis (5), and coracobrachialis (16). The posterior compartment muscle is triceps brachii (7, 9, 10).

The anterior compartment flexor muscles of the arm are innervated by the musculocutaneous nerve, and the large posterior compartment extensor muscle is innervated by the radial nerve.

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