extensor pollicis brevis (muscle)

ex·ten·sor pol·li·cis bre·vis (mus·cle)

muscle of posterior (extensor) compartment of forearm; origin, dorsal surface of distal radius and adjacent interosseous membrane; insertion, posterior aspect of base of proximal phalanx of thumb; action, extends and abducts the thumb at metacarpophalangeal joint; nerve supply, radial (posterior interosseous).
Farlex Partner Medical Dictionary © Farlex 2012
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