Pronator Quadratus

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The Pronator Quadratus is in the Deep Layer of the Anterior Forearm Compartment.

ATTACHMENTS:

• Distal anterior ulna to the distal anterior radius.
  • The attachments are onto the distal 1/4 of the ulna and radius.

ACTION:

• 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.