Also found in: Dictionary, Thesaurus.
A muscle with its origin in the back of the lateral condyle of the humerus, with insertion to the olecranon process and the posterior surface of the ulna, with nerve supply from the radial nerve, and whose action extends the forearm and abducts the ulna in pronation of the wrist.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.