The most important of these functions is to supinate the forearm and flex the elbow.

Its function is to supinate the forearm.

When the forearm is pronated, the brachioradialis tends to supinate as it flexes.

Because the ulnar and radial bones can rotate about each other the biceps can powerfully supinate the forearm.

Alternating movements: Patient is told e.g. to pronate and supinate his hands in rapid succession, holding forearms vertically.

If cavus is present, the first step in the manipulation process is to supinate the forefoot by gently lifting the dropped first metatarsal to correct the cavus.

Low speed flying might have been impaired by the lack of a bony keel on the sternum as attachment for the flight muscles; it is uncertain whether a true foramen triosseum was present, through which a tendon could elevate and supinate the wing.

A stab wound may damage the posterior cord and result in neurological deficits including an inability to abduct the shoulder the first 15 degrees, an inability to extend the forearm, reduced ability to supinate the hand, reduced ability to abduct the thumb and sensory loss to the posterior surface of the arm and hand.