Pronator Teres

Contraction of the pronator teres primarily causes pronation of the forearm and can aid in elbow flexion. It provides a small amount of resistance to valgus torque and valgus force.

The origin of the pronator teres is shared by the medial epicondyle of the humerus and the coronoid process of the ulna. Its insertion is in the middle of the lateral side of the radius.

This muscle is a part of the flexor-pronator mass. The diagram shows the pronator teres, in red, as the most anterior muscle in this mass.

See also: pronator quadratus.