Pronator teres
Arms
- Origin
- Humeral head: just above the medial epicondyle; ulnar head: coronoid process of the ulna
- Insertion
- Middle of the lateral surface of the radius
- Action
- Pronates the forearm (turns the palm down) and assists elbow flexion
- Nerve supply
- Median nerve (C6–C7)
A short muscle crossing the front of the forearm just below the elbow. It turns the palm down, the opposite of the biceps' supination.