supinator (muscle)

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su·pi·na·tor (mus·cle)

1. muscle of deep layer of proximal part of posterior compartment of forearm; origin, lateral epicondyle of humerus radial collateral and anular ligaments, and supinator ridge of ulna; insertion, anterior and lateral surface of radius; action, supinates the forearm; nerve supply, radial (posterior interosseous).
2. a muscle that supinates, that is, twists the forearm about a longitudinal axis from the pronated or neutral position toward one in which the palms face anteriorly (in the anatomic position).