Perineal membrane

The perineal membrane is an anatomical term for a fibrous membrane in the perineum. It is the superior border of the superficial perineal pouch, and the inferior border of the deep perineal pouch.

The perineal membrane is triangular in shape. It attaches to both ischiopubic rami of the pelvis. It also attaches to the perineal body. Its base is directed toward the rectum, and connected to the central tendinous point of the perineum. The base is fused with both the pelvic fascia and Colle's fascia.

It is continuous with the deep layer of the superficial fascia behind the superficial transverse perineal muscle, and with the inferior layer of the diaphragmatic part of the pelvic fascia.

If the inferior fascia of the urogenital diaphragm is detached on either side, the following structures will be seen between it and the superior fascia:

• the deep dorsal vein of the penis
• the membranous portion of the urethra
• the deep transverse perineal muscle and the urethral sphincter muscles
• the bulbourethral glands and their ducts
• the pudendal arteries and dorsal nerves of the penis
• the arteries and nerves of the urethral bulb
• a plexus of veins

Source : wikipedia
https://en.wikipedia.org/wiki/Perineal_membrane