Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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. The humerus (ME from Latin humerus, umerus upper arm, shoulder; Gothic ams shoulder, Greek mos) is a long bone in the arm or forelimb that runs from the shoulder to the elbow. Anatomically, it connects the scapula and the lower arm (consisting of the radius and ulna), and consists of the following three sections: Upper extremity of humerus - consisting of a rounded head, a narrow neck, and two short processes (tubercles, sometimes called tuberosities.) Body of humerus - cylindrical in its upper portion, and more prismatic below. Lower extremity of humerus - consisting of 2 epicondyles , 2 processes ( trochlea & capitulum ) , and 3 fossae ( radial fossa , coronoid fossa , and olecranon fossa )