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 ;
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Stabilization of the distal ulna by transfer of the pronator quadratus origin.
