extensor pollicis brevis muscle

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ex·ten·sor pol·li·cis brev·is mus·cle

(eks-ten'sŏr pol'i-sis brē'vis mŭs'ĕl)
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 joint (posterior interosseous).
Synonym(s): musculus extensor brevis pollicis, musculus extensor pollicis brevis, short extensor muscle of thumb.