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short palmar muscle

n.
  1. A muscle with origin from the palmar aponeurosis, with insertion into the skin of the ulnar side of the hand, with nerve supply from the ulnar nerve, and whose action wrinkles the skin on the medial side of the palm.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.