Biceps

Biceps ('double-headed'), an anatomical term applied to two muscles, the one belonging to the arm, the other to the leg, and distinguished from each other as the biceps flexor cubiti and the biceps flexor cruris. The former is the muscle which gives a full appearance to the front of the upper arm; the latter is situated on the back of the thigh, and is one of a group of three muscles known as the 'hamstrings.' See ARM.