abductor pollicis brevis (muscle)

ab·duc·tor pol·li·cis bre·vis (mus·cle)

[TA] superficial thenar muscle origin, tubercle of trapezium and flexor retinaculum; insertion, lateral side of proximal phalanx of thumb; action, abducts thumb; nerve supply, median. Synonym(s): musculus abductor pollicis brevis [TA], short abductor muscle of thumb