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
|
Upper Left Quadrant |
Lower Left Quadrant |
Lower Right Quadrant |
Upper Right Quadrant |
|
1. Tendon m. palmaris longus |
6. Tendon m. brachioradialis |
14. Tendons m. extensor digitorum communis |
20. Flexor digitorum profundus 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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