The pronator teres is a muscle located within the superficial flexor compartment of the anterior compartment of the forearm. Its main function is to pronate the forearm (rotate the radius on the ulna) along with pronator quadratus. This results in the palm of the hand moving from facing anteriorly in the anatomical position to facing posteriorly. It also acts as a weak flexor of the elbow joint. Pronator teres has two heads: a humeral head and an ulnar head. The larger, and more superficial, humeral head arises just proximal to the medial epicondyle and from the common flexor tendon. The ulnar head arises from the medial side of the ulnar coronoid process and joins the humeral head at an acute angle. The pronator teres passes obliquely across the forearm to end as a flat tendon, which inserts into an area midway along the lateral surface of the radial shaft. It is innervated by the median nerve (C6-7).
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