opponens pollicis (muscle)

(redirected from opposer (muscle) of thumb)

op·po·nens pol·li·cis (mus·cle)

[TA]
thenar muscle of palm; origin, ridge of trapezium and transverse carpal ligament (flexor retinaculum); insertion, anterior surface of the full length of the shaft of the first metacarpal bone; action, acts at carpometacarpal joint to "cup" palm, enabling one to oppose thumb to other fingers; nerve supply, median.