extensor pollicis brevis (muscle)

ex·ten·sor pol·li·cis bre·vis (mus·cle)

[TA]
muscle of posterior (extensor) compartment of forearm; origin, dorsal surface of distal radius and adjacent interosseous membrane; insertion, posterior aspect of base of proximal phalanx of thumb; action, extends and abducts the thumb at metacarpophalangeal joint; nerve supply, radial (posterior interosseous).
Full browser ?