Full Biceps Brachii Muscle (Long Head) Description
[Continued from above] . . . From the merger point, the entire muscle continues beyond the distal end of the humerus and inserts on the radial tuberosity of the radius.
Together with the short head, the long head of the biceps brachii acts as a flexor of the arm at the elbow joint and a supinator of the forearm. The biceps brachii, brachialis, and brachioradialis muscles all act as flexors of the arm at the elbow, with the brachialis acting as the agonist and the biceps brachii and brachioradialis acting as synergists. At the radioulnar joint in the forearm, the biceps brachii acts as a supinator to turn the palm of the hand upwards.
Prepared by Tim Taylor, Anatomy and Physiology Instructor