The term "inferior fascia of urogenital diaphragm", used in older texts, is considered equivalent to the perineal membrane.

[3] The apex is separated from the arcuate pubic ligament by an oval opening for the transmission of the deep dorsal vein of the clitoris.

The dorsal (posterior) portion consists of a sheet of dense fibrous tissue that attaches laterally to the ishiopubic rami and medially to the distal third of the vagina and to the perineal body.

[3] The perineal membrane provides support to the distal vagina and urethra by attaching these structures to the bony pelvis.

Its apex is directed forward, and is separated from the arcuate pubic ligament by an oval opening for the transmission of the deep dorsal vein of the penis Its lateral margins are attached on either side to the inferior rami of the pubis and ischium, above the crus penis.