The elbow-joint is a ginglymus or hinge joint. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna of the forearm. The elbow is the region surrounding the elbow-joint. The bony prominence at the very tip of the elbow is the olecranon process of the ulna, and the inner aspect of the elbow is called the antecubital fossa. Movements Two main movements are possible at the elbow: The hinge-like bending and straightening of the elbow (flexion and extension)… (More on Elbow)