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extensor pollicis brevis

[ pŏlə-sĭs, -kĭs ]
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n.
A muscle with origin from the trapezium and the flexor retinaculum, with insertion to the proximal phalanx of the thumb, with nerve supply from the median nerve, and whose action abducts 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.

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