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On one side of the hemisected pelvis, remove the viscera to examine the muscles that form the pelvic diaphragm, a thin funnel-shaped plate which separates the pelvis from the perineum. The pelvic diaphragm consists of two paired muscles, the levator ani muscle and the coccygeus muscle.

Links and References:
Grant's: 3.41
Netter (1ed.): 377, 337, 338 (2ed.): 373, 333, 334
Rohen/Yokochi: 323