What bones and muscles are found at the elbow joint?

The elbow joint is composed of three bones. Two of those bones, the radius and ulna, belong to the forearm; the humerus is the third bone. The forearm muscles attach to bony bumps on the inner and outer portions of the humerus at the elbow joint.

These bumps are the epicondyles. The muscles that control rotation of your forearm -- the pronators that rotate your forearm into the hand-down position, and the supinators that rotate your forearm into the hand-up position -- attach to the epicondyles. The pronators and supinators lie deeper than other muscles that control the wrist and hand movements, which also connect at the epicondyles.

The pronator teres muscle originates at both the ulna bone and inner (medial) epicondyle and inserts onto the radius bone. The pronator quadrates is found closer to the wrist and connects the radius and ulna. The supinator muscle originates on the outer (lateral) epicondyle and inserts onto the radius.

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