The supinator (su'pi-na-tor) is a short muscle whose fibers run from the ulna and the lateral end of the humerus to the radius. It assists the biceps brachii in rotating the forearm laterally (supination) (fig. 9.30).

The pronator teres (pro-na'tor te'rez) is a short muscle connecting the ends of the humerus and ulna to the radius. It rotates the arm medially, as when the hand is turned so the palm is facing downward (pronation) (fig. 9.30).

The pronator quadratus (pro-na'tor kwod-ra'tus) runs from the distal end of the ulna to the distal end of the radius. It assists the pronator teres in rotating the arm medially (fig. 9.30).

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