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flexor pollicis brevis

[ pŏlə-sĭs, -kĭs ]
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n.
A muscle with origin from the flexor retinaculum of the wrist and from the ulnar side of the first metacarpal, with insertion to the base of the proximal phalanx of the thumb, with nerve supply from the median and ulnar nerves, and whose action flexes the proximal 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.

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