<prompt> Function of anconeus isPronationSupinationFlexionExtension  <response>: ANCONEUS:- Origin: back of lateral epicondyle.Inseion:-lateral side of olecranon process. and upper surface of posterior surface of ulna.Nerve supply: nerve to anconeus. Branch of radial nerveAction:weak extensor of elbow joint.Reference: vishram singh, pg no.129 