The pelvic diaphragm forms most of the pelvic floor and in its anterior regions contains a U-shaped defect, which is associated with elements of the urogenital system.
The anal canal passes from the pelvis to the perineum through a posterior circular orifice in the pelvic diaphragm.
The pelvic floor is supported anteriorly by: the perineal membrane, and muscles in the deep perineal pouch.