Pronator Quadratus Muscle

Medically reviewed by: Stephanie Curreli, MD, PhD
Last Updated: Jun 26, 2015

The pronator quadratus muscle runs from the far end of the ulna (longest forearm bone) to the far end of the radius (shortest forearm bone). It assists the pronator teres in rotating the arm toward the inside, as when the hand is turned so the palm is facing downward.

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