Attaching to the wrist and elbow, the forearm supinates, or rolls palm
forward. In this position, in which you could hold a bowl of soup, the
forearm requires assistance from the biceps in order to lift the bowl to
your mouth. Without the pulley action of the biceps, the forearm and
wrist would lack sufficient flexibility to allow you to feed yourself,
dress, brush your teeth or arm wrestle. The biceps brachii flexes the
supinated forearm at the elbow.
The distal end of the muscle, attaches to the radius, the
bone in the forearm on the thumb side of the arm.
