The biceps brachii, known simply as the biceps, is a muscle that is involved in the movement of the elbow and shoulder. It is a double-headed muscle, meaning that it has two points of origin or “heads” in the shoulder area. The short head of each biceps brachii originates at the top of the shoulder blade. The long head originates just above the shoulder joint. Both heads are joined at the elbow.

The biceps brachii helps control the motion of two different joints, the shoulder and the elbow. The function of the biceps at the elbow is essential to the function of the forearm in lifting. The function of the biceps brachii at the shoulder is less pronounced, playing minor roles in moving the arms forward, upward, and sideways.