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opposer muscle of thumb

n.
  1. A muscle with origin from the trapezium bone and the flexor retinaculum, with insertion into the first metacarpal bone, with nerve supply from the median nerve, and whose action allows the thumb to move in a direction in contrast to that of the other 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.