origin, tubercle of trapezium and flexor retinaculum; insertion, lateral side of proximal phalanx of thumb; action, abducts thumb; nerve supply, median. Syn: musculus abductor pollicis brevis [NA], short abductor muscle of thumb.
Health4All
origin, tubercle of trapezium and flexor retinaculum; insertion, lateral side of proximal phalanx of thumb; action, abducts thumb; nerve supply, median. Syn: musculus abductor pollicis brevis [NA], short abductor muscle of thumb.