The pronator teres is a forearm muscle that turns the palm downward. Its humeral head arises from the medial epicondyle and its ulnar head from the coronoid process of the ulna. It inserts on the lateral radial shaft. The median nerve supplies it.
| Origin | Humeral head: medial epicondyle of the humerus. Ulnar head: coronoid process of the ulna. |
|---|---|
| Insertion | Pronator tuberosity on the middle of the lateral surface of the radius. |
| Innervation | Median nerve (C6-C7). |
| Blood supply | Ulnar artery and radial artery. |
| Action | Pronates the forearm and weakly flexes the elbow. |
3D model: BodyParts3D (CC BY 4.0), adult male reference anatomy. Highlighted structure shown with nearby bones for context.
The median nerve passes between the two heads of the pronator teres, and the muscle forms the medial border of the cubital fossa.
It rotates the forearm so the palm faces down.
The median nerve.
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