The biceps brachii

The biceps brachii is a two-headed muscle located in the upper arm that is responsible for flexing the elbow and rotating the forearm. The long head of the biceps brachii originates from the scapula, while the short head originates from the coracoid process of the scapula. Injuries to the biceps brachii can occur from overuse, heavy lifting, or trauma and can result in pain, weakness, and limited range of motion in the affected arm.