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Pronator quadratus is a square shaped muscle on the distal forearm that acts to pronate (turn so the palm faces downwards) the hand. As it is on the anterior side of the arm, it is innervated by a branch of the median nerve, the anterior interosseous nerve (roots C8 and T1 with T1 being primary).
A square shaped muscle, found deep to the tendons of the FDP and FPL. 1  Attachments: Originates from the anterior surface of the ulna, and attaches to the anterior surface of the radius. 2  Actions: Pronates the forearm. 3  Innervation: Median nerve (anterior interosseous branch).