The biceps brachii muscle is a muscle located in the upper arm. It is a two-headed muscle that is responsible for flexing the elbow joint and supinating the forearm. Flexion of the elbow joint means that the biceps brachii helps to bend the arm at the elbow, bringing the hand closer to the shoulder. Supination of the forearm means that the biceps brachii helps to rotate the forearm so that the palm faces upwards. These movements are important for activities such as lifting objects or turning a doorknob.

The biceps brachii muscle has two heads: the long head and the short head. The long head originates from the supraglenoid tubercle of the scapula bone, and the short head originates from the coracoid process of the scapula bone. Both heads insert onto the radial tuberosity of the radius bone.

One example of how the biceps brachii muscle is used is when you lift a heavy object off the ground. To do this, you need to flex your elbow joint and supinate your forearm, which is facilitated by the biceps brachii muscle. This movement allows you to grip the object securely and lift it with the necessary force.

Examples include: