Long Head of Biceps Brachii

Short Head of Biceps Brachii

The biceps brachii muscle derives its name from its two proximally attached tendinous heads. The Short Head of Biceps Brachii arises by a thick flattened tendon from the coracoid process. The Long Head of Biceps Brachii arises from the supraglenoid tubercle within the capsule of the shoulder joint. The two tendons converge into elongated bellies and insert on the radial tuberosity. The biceps is a powerful supinator, especially in rapid or resisted movements. It flexes the elbow, most effectively with the elbow supinated. The musculocutaneous nerve innervates the biceps brachii muscle.

To test the biceps, the elbow joint is flexed against resistance when the forearm is supinated. If normal, the biceps muscle forms a prominent bulge on the anterior aspect of the arm that is easily palpable. Rupture of the biceps results in a popeye the sailor man muscle.