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Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.27

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 4.27

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Tendon m. flexor carpi radialis
2. Tendon m. flexor pollicis longus
3. Tendon m. extensor pollicis brevis
4. Tendon m. abductor pollicis longus

5. Radial a.
6. Tendon m. extensor carpi radialis longus
7. Articular cavities
8. Tendon m. extensor carpi radialis brevis
9. Carpal bone, scaphoid
10. Tendon m. extensor pollicis longus
11. Carpal bone, capitate

12. Tendon m. extensor digitorum communis
13. Extensor retinaculum
14. Carpal bone, hamate
15. Tendon m. extensor digiti minimi
16. Carpal bone, triquetral
17. Tendon m. extensor carpi ulnaris
18. Radiate carpal ligament
18a. Carpal bone, pisiform

19. Abductor digiti minimi m.
20. Tendon flexor carpi ulnaris
21. Tendons m. flexor digitorum profundus
22. Ulnar a. and nerve
23. Palmaris brevis m.
24. Transverse carpal ligament
25. Tendons m. flexor digitorum superficialis
26. Median nerve
27. Tendon m. palmaris longus

This section reveals the palmaris brevis muscle (23) for the first time. The tendon of palmaris longus (27) is positioned directly above the median nerve (26), which is in the carpal tunnel and covered by the transverse carpal ligament (24). Beneath the carpal tunnel or canal is the spread (radiate) carpal ligament (18), which consists of collagenous fibers that radiate from the capitate (11) to the scaphoid, lunate, and triquetrum bones. In addition, some fibers join the trapezium and trapezoid with the scaphoid (9), others pass between the hamate (14) and triquetral bones (16), and, finally, a separate band of the same ligament is joined to the pisiform bone (18a).

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