<prompt> Muscle that does not constitute the pelvic diaphragm is:PuborectalisIliococcygeusPubococcygeusIschiococcygeus  <response>: Ans. A. PuborectalisCoccygeus and ischio coccygeus are one and the same.pelvic diaphragm is composed of pubococcygeus, iliococcygeus and ischio coccygeus. 