Cleidobrachialis

Cleidobrachialis is a small muscle located in the upper arm, specifically in the anterior (front) compartment of the arm. It is one of the muscles that make up the rotator cuff, a group of muscles and tendons that stabilize the shoulder joint. The cleidobrachialis muscle originates from the medial (inner) border of the clavicle and inserts into the humerus, specifically the greater tubercle of the humerus. Its primary function is to assist in the abduction of the arm, helping to lift the arm away from the body. The muscle is innervated by the upper and lower subscapular nerves, which are branches of the brachial plexus. The cleidobrachialis muscle is often considered a minor contributor to the rotator cuff, but it plays a role in shoulder stability and movement. It is a relatively small muscle, and its significance is sometimes overlooked in discussions of the rotator cuff. However, it is an important component of the shoulder's complex musculature.