The pronator quadratus is a two-headed muscle. Action: Pronates forearm; deep fibers bind radius and ulna together Innervation: Anterior interosseous nerve from median nerve (C8 and T1) Arterial Supply: Anterior interosseous artery [3] In the anatomical and functional literature, the muscle has been neglected to a high extend. It is also used to turn the wrist and palm of the hand. Contraction of the pronator quadratus and the supinator results in forearm pronation. Insertion: Attaches to the anterior surface of the radius. Pronator Quadratus is a deep-seated, short, flat, and quadrilateral muscle with fibres running in a parallel direction. The pronator quadratus originates from the distal quarter of the anterior surface of the ulna.. Insertion. The pronator quadratus muscle is unique in that it is the only muscle attached only to the radius at one end and the ulna at the other. Nerve supply: Median nerve (anterior interosseous branch). Click to read more details. [2] The pronator quadratus muscle is compacted in a small closed compartment, covered by the interosseous membrane dorsally and distally and by its own fascia volarly. Origin: Originates from the anterior surface of the ulna. The pronator quadratus originates on the radius and inserts on the ulna. The pronator quadratus (or pronator quadratus muscle, latin: musculus pronator quadratus) is a square shaped muscle of the forearm that belongs to the anterior muscle group and is situated in the third or deep layer.. Arising with two heads from the humerus and ulna to finally insert on the lateral surface of the radius body. origin: distal 1/4 of the volar (ant) surface of the ulna; insertion: distal 1/4 of the volar surface of the radius; action: pronates the forearm; nerve supply: Median , C7 , C8 , T1 ; synergists: Pronator Teres Stabilization of the distal ulna by transfer of the pronator quadratus origin. Pronator teres is one of the muscles of the superficial flexor group of the anterior forearm compartment. Pronator teres muscle (Musculus pronator teres) Pronator teres is a fusiform muscle found in the anterior forearm.It belongs to the group of superficial flexors of the forearm, together with flexor carpi radialis, palmaris longus, flexor digitorum superficialis and flexor carpi ulnaris muscles.Pronator teres is the most lateral muscle of this group. Function: Pronates the forearm. An example of a common daily action the pronator quadratus muscle would assist with is turning a screwdriver. The pronator teres originates on the medial epicondyle and inserts on the radius. Upper Extremity Muscle Atlas Abductor Pollicis Longus Abductor Digiti Minimi Abductor […] Pronator Quadratus: A square shaped muscle found deep to the tendons of the FDP and FPL. Origin.

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