The coracobrachialis is a small muscle located in the upper arm. It originates from the coracoid process of the scapula and inserts into the middle of the humerus. This muscle plays a role in flexing and adducting the arm at the shoulder joint. Functionally, the coracobrachialis assists in movements such as lifting the arm forward and bringing it closer to the body. It is innervated by the musculocutaneous nerve, which is responsible for transmitting signals that control muscle contractions in this area.