The primary function of the biceps brachii muscle is to flex the elbow joint, which involves bringing the hand towards the shoulder. The biceps brachii muscle also helps to rotate the forearm, allowing the hand to turn over or supinate. In addition to these actions at the elbow joint, the biceps brachii muscle also plays a role in moving the shoulder joint and stabilizing the shoulder blade.
The biceps brachii muscle is involved in a variety of activities that require arm and hand movement, such as lifting, carrying, and throwing. It is also important for activities that require fine motor control, such as writing, typing, and playing musical instruments. In addition, the biceps brachii muscle helps to maintain good posture and balance by stabilizing the shoulder blade and upper arm.
Overall, the biceps brachii muscle is a strong and powerful muscle that plays a vital role in many different activities that require arm and hand movement.