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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 4.24

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 4.24

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. Antebrachial fascia, lower forearm
5. Tendon m. flexor pollicis longus
6. Radial a.
7. Superficial fascia, lower forearm
8. Pronator quadratus m.

9. Tendon m. abductor pollicis longus
10. Tendon m. brachioradialis, insertion
11. Tendon m. extensor pollicis brevis
12. Radius
13. Tendon m. extensor carpi radialis longus
14. Tendon m. extensor carpi radialis brevis
15. Extensor pollicis longus m. and tendon
16. Tendons m. extensor digitorum communis

17. Extensor indicis m. and tendon
18. Tendon m. extensor digiti minimi
19. Tendon m. extensor carpi ulnaris
20. Ulna, head
21. Pronator quadratus m. (last appearance)

22. Flexor carpi ulnaris m. and tendon
23. Ulnar nerve
24. Flexor digitorum profundus m. and tendons
25. Ulnar a.
26. Tendons m. flexor digitorum superficialis

In this section pronator quadratus (8, 21) is thinning and is seen for the last time. All other muscles are tendinous.

The radius is still expanding and will ultimately articulate with three carpal bones. The head of the ulna (20) is beginning to articulate with the radius (12). Note the articular cartilage at its medial border (articular surface) adjacent to the radius.

The tendons of flexor digitorum superficialis (26) and profundus (24) and flexor pollicis

longus (5) and the median nerve (2) are already enclosed within a fascial covering before entering the carpal tunnel. Flexor carpi radialis (3) enters the hand through its own osteofibrous tunnel formed by the attachment of the flexor retinaculum to the two borders of the groove on the trapezium. The tendon of flexor carpi radialis (3) is already separated by a fascial sheath (4) from the tendons that enter the carpal tunnel.

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