The pronator quadratus muscle pronates the forearm and helps the triceps muscle extend the elbow.
- Origin: Distal quarter of the anterior side of the ulna.
- Insertion: Distal quarter of the anterior side of the radius.
- Actions: Pronation of the forearm
- Innervation: Median nerve
- Daily uses: Screwing in a screw with a screwdriver
- Example stretches: Maximum supination of the forearm.