Biceps brachii Commonly known as the biceps is a two-headed muscle that lies on the upper arm between the shoulder and the elbow. It is a large muscle. The biceps brachii muscle is one of the chief and prominent muscles of the arm. Origin: Biceps brachii has two head. Short head originates from the tip of coracoid process of scapula; Long head originates from supraglenoid tubercle of scapula. Insertion: It is Inserted at Tuberosity of radius and fascia of forearm via bicipital aponeurosis . Action: Supinates forearm and, when it is supine, flexes the forearm Nerve Supply: Biceps brachii supplied by Musculocutaneous nerve (C5 and C6 ). Arterial Supply: Muscular branches of the brachial artery.