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long extensor muscle of thumb

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