Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb
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
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Upper Left Quadrant |
Lower Left Quadrant |
Lower Right Quadrant |
Upper Right Quadrant |
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1. Tendon m. flexor carpi radialis |
5. Radial a. |
12. Tendon m. extensor digitorum communis |
19. Abductor digiti minimi m. |
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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