Urogenital diaphragm

The urogenital diaphragm is the traditional (but invalid) anatomical term for a layer of the pelvis that separates the deep perineal sac from the upper pelvis, lying between the inferior fascia of the urogenital diaphragm and superior fascia of the urogenital diaphragm.

Anatomy
While this term is used to refer to a layer of the pelvis that separates the deep perineal sac from the upper pelvis, such a discrete border of the sac probably does not exist. While it has no official entry in Terminologia Anatomica, the term is still used casually to refer to the following structures (taken together) :
 * sphincter urethrae muscle (external urethral muscle )
 * deep transverse perineal muscle
 * superficial transverse perineal muscle
 * perineal membrane

The urogenital diaphragm is often confused with the pelvic floor, which is a true diaphragm supporting many of the pelvic organs. --