<prompt> Strongest supinator muscle is -SupinatorBicepsBrachialisBrachioradialis  <response>: Ans. is b i.e., Biceps The biceps brachii is the strongest supinator of the forearm because of its distal attachment on the radial tuberosity MovementMuscles causing movementPronationPronator quadratus strong pronator. Pronator teres Rapid pronator.SupinationSupinator when elbow is extended, Biceps when elbow is flexed. 