The supinator muscle is located in the forearm and is part of the lateral compartment. It is a relatively small muscle that runs along the proximal part of the radius.
Originating from the lateral epicondyle of the humerus and the radial collateral ligament, the supinator takes its starting point from the bony and ligamentous structures in the upper limb.
The muscle inserts into the lateral and posterior surfaces of the proximal third of the radius. This insertion site establishes a connection with the upper part of the forearm bone.
Functionally, the supinator is a powerful supinator of the forearm. It plays a key role in turning the palm upward or facing forward, as opposed to the palm facing downward. Additionally, the muscle assists in maintaining the stability of the elbow joint during supination movements. The supinator is particularly active in activities such as turning a doorknob, using a screwdriver, or any movement that involves rotating the forearm. It contributes to the complex movements and functional range of motion in the upper limb.