Radial collateral ligament (elbow)

The radial collateral ligament (external lateral ligament) is a short and narrow fibrous band, less distinct than the ulnar collateral, attached, above, to a depression below the lateral epicondyle of the humerus; below, to the annular ligament, some of its most posterior fibers passing over that ligament, to be inserted into the lateral margin of the ulna.

It is intimately blended with the tendon of origin of the Supinator.