extensor pol·li·cis brevis (p l  -s s, -ks)n. A muscle with origin from the trapezium and the flexor retinaculum, with insertion to the proximal phalanx of the thumb, with nerve supply from the median nerve, and whose action abducts the thumb. |
extensor pollicis brevis,
a muscle that extends the metacarpophalangeal and carpometacarpal joints of the thumb.
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