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 4.25

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. Median nerve 2. Antebrachial fascia 3. Tendon m. flexor carpi radialis 4. Tendon m. flexor pollicis longus 5. Radial a. 6. Tendon m. abductor pollicis longus	7. Tendon m. extensor pollicis brevis 8. Radius, distal 9. Radial nerve, superficial br. 10. Tendon m. extensor carpi radialis longus 11. Tendon m. extensor carpi radialis brevis 12. Tendon m. extensor pollicis longus 13. Extensor retinaculum	14. Tendon m. extensor digitorum communis 15. Tendon m. extensor digiti minimi 16. Radioulnar articulation, distal 17. Tendon m. extensor carpi ulnaris 18. Ulnar collateral ligament, distal 19. Ulna, head 20. Radioulnar joint, articular cavity 21. Basilic v.	22. Radiocarpal ligament 23. Flexor carpi ulnaris m. and tendon 24. Tendons m. flexor digitorum profundus 25. Ulnar nerve 26. Ulnar a. 27. Tendon m. flexor digitorum superficialis 28. Antebrachial fascia and tendon m. palmaris longus

This is the last section of the forearm. Subsequent sections are of the wrist and hand.

The radioulnar articulation is well seen in this section. The head of the ulna (19) articulates with the radius (16). Note the joint, articular space, and cavity (20).

The radius and ulna are seen for the last time. The strong radiocarpal ligament (22) makes its first appearance. The ligament extends from the distal end of the radius posteriorly to join the proximal row of carpal bones.

Note how the dorsal surface of the radius is grooved to accommodate the tendons of the extensor muscles (10, 11, 12, 14).

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