This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
Muscle that does not constitute the pelvic diaphragm is: 
Select and explain. 
A. Puborectalis, B. Iliococcygeus, C. Pubococcygeus, D. Ischiococcygeus
A: Puborectalis
Answer: A: Puborectalis 
Explanation: Ans. A. PuborectalisCoccygeus and ischio coccygeus are one and the same.pelvic diaphragm is composed of pubococcygeus, iliococcygeus and ischio coccygeus.