Anconeus&colon; originates on the humerus and inserts on the proximal end of the ulna. The humerus has a shallow curve, in contrast to the straight ulna and radius. In human anatomy, the ulnar nerve is a nerve that runs near the ulna bone. The superficial components insert directly onto the ulna styloid. These ligaments prevent dorsal migration of the distal ulna. The ulnar variance influences the amount of load that is transmitted through the distal ulna. The third landmark is the olecranon found at the head of the ulna. The fusion of the radius and ulna prevents an ungulate from rotating its forelimb. Nonsurgical treatment results in persistent or recurrent dislocations of the distal ulna. The TFC is an articular discus that lies on the pole of the distal ulna. The ulna continues growing straight, resulting in a dorsally prominent distal ulna. Pronator quadratus&colon; originates on surfaces of the radius and ulna. The 6th compartment is in the groove on the dorsum of inferior side of ulna. The forearm includes a flat, broad, crescent-shaped ulna and a "robust and pillar-like" radius. It attaches to the bones near the radius and ulna.