Humerus connects the scapula and the lower arm (consisting of the radius and ulna), and consists of three sections. The upper extremity consists of a rounded head, a narrow neck, and two short processes (tubercles, sometimes called tuberosities.) Its body is cylindrical in its upper portion, and more prismatic below. The lower extremity consists of two epicondyles, two processes (trochlea & capitulum), and three fossae (radial fossa, coronoid fossa, and olecranon fossa) (informatin from Wikipedia)