Left: The superficial layer of the muscles of the flexor surface of the forearm together with the brachioradialis, seen from in front. Right: The superficial layer of the muscles of the flexor surface of the the forearm after removal of the palmaris longus and the flexor carpi radialis, seen from in front and slightly from the radial side. The brachioradialis is drawn outward to show the supinator and the insertion of the tendon of the biceps.