extensor pollicis brevis

noun
extensor pol·li·cis brev·is | \-ˈpäl-ə-səs-ˈbrev-əs, -ˈpäl-ə-kəs- \

Medical Definition of extensor pollicis brevis 

: a muscle that arises from the dorsal surface of the radius, extends the first phalanx of the thumb, and adducts the hand

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