What is the biceps?
The biceps or biceps brachii is a muscle with two heads – a long head and a short head. It lies on the upper arm between the shoulder and the elbow. Both heads begin on the scapula or shoulder blade and join to form a single muscle belly which is attached to the upper forearm.
Its main function is to flex the forearm and supinate the forearm at the elbow. Each of these movements are used when opening a bottle with a corkscrew: first biceps unscrews the cork (supination), then it pulls the cork out (flexion). One can also say that the biceps turns the hand to face the palm uppermost and flexes the arm and forearm.
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