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 |
7. Tendon m. brachioradialis |
13. Extensor pollicis longus m. |
22. Flexor carpi ulnaris m. |
This section passes through pronator quadratus muscle (21), which makes its first appearance. Pronator quadratus is in the deepest layer (fourth) of the muscles of the anterior forearm. It arises from the medial side of the ventral surface of the distal fourth of the ulna. The muscle is inserted on the distal quarter of the ventral surface of the radius by means of an aponeurosis. The muscle lies on the radius and ulna, the ventral surface of the interosseous membrane, and the distal radioulnar joint. The muscle is often separated into superficial and deep portions and it tends to be thicker distally than proximally. This muscle is innervated by the anterior interosseous nerve, which enters its deep surface.
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