Supinator

Definition

The supinator is a muscle in the forearm that helps rotate the forearm to turn the palm upward or forward. It plays a crucial role in movements such as turning a doorknob or opening a jar.

Related terms

Pronator Teres: A muscle of the forearm that performs the opposite action of the supinator by rotating the forearm and hand so that the palm faces downward.

Biceps Brachii: A large muscle of the upper arm that also assists in supinating the forearm along with its primary function of flexing at the elbow.

Radius: The lateral bone of the forearm that rotates over the ulna when performing actions such as pronation and supination facilitated by muscles like the supinator