Random Fact
Biceps are muscles that have two heads—the large flexor muscle of the front of the upper arm and the large flexor muscle of the back of the upper leg. The first is called the biceps brachii and the second is the biceps femoris, both parts of the human muscular system. The action of the biceps brachii flexes the arm at the elbow and shoulder and supinates the forearm—turns the palm forward or upward. To raise your hand, the biceps in the front of your upper arm contracts and pulls up the bones of your forearm. The biceps femoris is one of the hamstring muscles at the back of the thigh. This muscle extends the thigh, rotates it outward, and flexes the leg at the knee. The term biceps is from Latin bis, “two,” and caput, “head”.