long abductor muscle of thumb
A muscle with origin from the posterior surfaces of the radius and the ulna, with insertion to the base of the first metacarpal bone, with nerve supply from the radial nerve, and whose action abducts the thumb and assists in extending it.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.