The biceps brachii muscle

Demonstration of the function of the biceps brachii muscle, the full range of motion of the elbow joint, deformation of the joint capsule, and the primary stabilizer of the elbow joint - the ulnar collateral ligament.

Note the additional supination movement of the forearm. The insertion point of the biceps muscle is the internally oriented radial tuberosity, so the pulling on radial tuberosity results in the combined motion - the flexion and supination of the forearm.

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