Traditionally used entity of the collection of tissues between the inferior pubic rami that cover the urogenital hiatus, both superfical and deep to the perineal membrane.
The urogenital diaphragm is a more superficial muscular sheet that spans the outlet of the pelvis. The urogenital diaphragm fills the space within the pubic arch.These muscles act as a sphincter that closes the urethra by compression and opens it by relaxation to control the flow of urine.