In human anatomy, the biceps brachii, or simply biceps in common parlance, is, as the name implies, a two-headed muscle
located on the upper arm. Both heads arise on the scapula and join to form a single muscle belly which is attached to
the upper forearm. While the biceps crosses both the shoulder and elbow joints, its main function is at the latter where
it flexes the elbow and supinates the forearm. Both these movements are used when opening a bottle with a corkscrew: first
biceps unscrews the cork (supination), then it pulls the cork out (flexion). -Wiki-