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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 4.23

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 4.23

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. palmaris longus
2. Median nerve
3. Tendon m. flexor carpi radialis
4. Flexor pollicis longus m.
5. Radial a.

6. Tendon m. brachioradialis
7. Tendon m. abductor pollicis longus
8. Tendon m. abductor pollicis brevis
9. Radius
10. Tendon m. extensor carpi radialis longus
11. Extensor pollicis brevis m.
12. Tendon m. extensor carpi radialis brevis
13. Extensor pollicis longus m. and tendon

14. Tendons m. extensor digitorum communis
15. Extensor indicis proprius m. and tendon
16. Tendon m. extensor digiti minimi
17. Tendon m. extensor carpi ulnaris
18. Ulna
19. Pronator quadratus m.

20. Flexor digitorum profundus m. and tendons
21. Flexor carpi ulnaris m. and tendon
22. Ulnar nerve
23. Ulnar a.
24. Flexor digitorum superficialis m. and tendons

In this section, the largest muscle mass is that of pronator quadratus (19); the other muscles of the distal forearm are primarily tendinous.

The radius (9) is expanding at its distal end and will terminate with its styloid process. The ulna (18) has not yet expanded to form its head and articulation with the radius. The

radiocarpal articulation involves the radius and its articular disk and the scaphoid, lunate, and triquetral carpal bones. The distal extremity of the ulna (18) articulates with the radius to accommodate the movements of pronation and supination of the forearm and hand.

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