extensor pollicis brevis (muscle)
Definition: 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).
Synonym(s): musculus extensor pollicis brevisTA, musculus extensor brevis pollicis, short extensor (muscle) of thumb
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