pronator quadratus (muscle)

pro·na·tor quad·ra·tus (mus·cle)

[TA] muscle of deep layer of anterior (flexor) compartment of forearm; origin, distal fourth of anterior surface of ulna; insertion, distal fourth of anterior surface of radius; action, pronates forearm; nerve supply, anterior interosseous. Synonym(s): musculus pronator quadratus [TA], quadrate pronator muscle