ABSTRACT
The anterior compartment of the arm has coracobrachialis (4), a shoulder adductor, medially with brachialis and biceps anteriorly. Brachialis passes from the humerus to the ulna and flexes the elbow. Biceps (5) has a short head (6) from the coracoid process and a long head (7) from the supraglenoid tubercle of the scapula. Both heads converge on a tendon (8) that inserts into the radial (bicipital) tuberosity, and also into the bicipital aponeurosis (9), which merges with the deep fascia to attach to the ulna. Biceps is a powerful flexor and supinator. The musculocutaneous nerve (11) (C5,6,7) supplies all three muscles before becoming the lateral cutaneous nerve of the forearm.
