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The Pronator Quadratus is in the Deep Layer of the Anterior Forearm Compartment.
- Distal anterior ulna to the distal anterior radius.
- Pronates the forearm at the radioulnar joints.
NOTE: The pronator quadratus is much smaller than the pronator teres, but it has a strong leverage force because it is located farther from the axis of motion at the proximal radioulnar joint.