Pronator Quadratus Muscle
by ![Tim Taylor]()
Written by
Tim Taylor
Anatomy & Physiology Senior Writer
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
Last updated: Mar 29th, 2025
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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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