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extensor muscle of fingers

n.
  1. A muscle with origin from the lateral epicondyle of the humerus, with insertion into the base of the proximal, middle, and distal phalanges, with nerve supply from the radial nerve, and whose action extends the fingers.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.