abductor pollicis longus (muscle)
Definition: outcropping muscle of posterior compartment of forearm; origin, interosseous membrane and posterior surfaces of radius and ulna; insertion, lateral side of base of first metacarpal bone; action, abducts and assists in extending thumb; nerve supply, radial.
Synonym(s): musculus abductor pollicis longusTA, long abductor muscle of thumb, musculus extensor ossis metacarpi pollicis
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