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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 4.6

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 4.6

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Cephalic v.
2. Lateral antebrachial cutaneous nerve
3. Brachioradialis m.
4. Radial nerve

5. Lateral epicondylar ridge of humerus
6. Triceps brachii, lateral head m.

7. Tendon m. triceps brachii
8. Triceps brachii, long head m.
9. Ulnar nerve
10. Superior ulnar collateral a.

11. Superficial (fatty) fascia
12. Basilic v. and anastomotic v.
13. Median nerve
14. Brachial a. and v.
15. Hematoma in superficial (fatty) fascia
16. Brachialis m.
17. Tendon m. biceps brachii

This section is one below the preceding one (1 cm), and the next series of sections concern the elbow region.

Triceps brachii is decreasing in size, and a thick vertical tendinous band is forming between the long (8) and lateral (6) heads of triceps brachii.

The biceps brachii has become tendinous (17). Part of the tendon will form a thin flat band of connective tissue joining the antebrachial fascia called the lacertus fibrosus; the remainder forms a thick band, the biceps tendon, which will insert onto the biceps tuberosity of the radius in the forearm.

The nerve supply to the muscles of the forearm and hand is provided by the radial, median, and ulnar nerves. The radial nerve (4) supplies the extensor (dorsal) forearm muscles. The median nerve (13) supplies all of the flexor forearm muscles except the medial half of flexor digitorum profundus and flexor carpi ulnaris, which are supplied by the ulnar nerve (9). In addition, the median nerve usually supplies the thumb (intrinsic hand) muscles and the first and second lumbrical muscles. The remainder of the hand is usually supplied by the ulnar nerve (9).

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