Origin Short head: tip of coracoid process of scapula; Long head: supraglenoid tubercle of scapula Insertion Tuberosity of radius and fascia of forearm via bicipital aponeurosis Action Supinates forearm and, when it is supine, flexes forearm Innervation Musculocutaneous nerve (C5,C6 ) Arterial Supply Muscular branches of brachial artery