round pronator muscle

round pronator muscle n.

1. A muscle whose superficial head has origin from the humerus and whose deep head has origin from the ulna, with insertion into the radius, with nerve supply from the median nerve, and whose action pronates the forearm.

The American Heritage® Stedman’s Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.