BICEPS, the name given to one of the muscles of the upper arm, from which the latter derives its rounded appearance in front. It has two heads or origins, the shorter attached to the cor acoid process of the scapula, the longer to the edge of the glenoid cavity. The two heads unite to form a central portion or belly, which ends in a tendon, the distal end of which is inserted on the radius. The muscle on contraction has the effect of flexing the forearm and assisting in the supination of the hand. See MUSCLES and MUSCULAR SYSTEM.