Connection lost. Please refresh the page.
Get help How to study Login Register
Ready to learn?
Pick your favorite study tool

Urogenital diaphragm

Recommended video: Peritoneal relations [27:50]
Peritoneal cavity as seen in a parasagittal section.

The urogenital diaphragm, also known as the triangular ligament, is a strong sheet of striated skeletal muscle that occupies the area between the pubic symphysis and ischial tuberosities.

Both the urinary and genital orifices pierce through the urogenital diaphragm.

Several skeletal muscles make up the urogenital diaphragm including:

  • the deep transverse perineal muscle arising from the ischium and inserting on the perineal body. It covers the space around the urogenital orifices.
  • the external urethral sphincter arising from the pubis and ischium and inserting on the penis in males and the vagina in females. It surrounds the urethra.
  • the bulbospongiosus muscle arising from the perineal body and enveloping the penis in males or the vagina in females before inserting on the penis or clitoris. It fills the medial space of the urogenital diaphragm.
  • the ischiocavernosus muscles arising from the ischium and pubis and extending anteriorly and medially to the penis in males or the clitoris in females. They occupy the lateral edges of the urogenital diaphragm.
  • the superficial transverse perineal muscle arising from the ischial tuberosity and inserting on the perineal body. It forms the base of the urogenital diaphragm.

A pair of thin membranes made of irregular connective tissue, the superior and inferior fascia, cover the muscles of the urogenital diaphragm.

The urogenital diaphragm functions to support the urethra. Contraction of the bulbospongiosus, deep transverse perineal and external urethral sphincter muscles assist in the propulsion of urine out of the urethra at the end of urination and, in males, semen during ejaculation. Additionally, the urogenital diaphragm provides support and protection to the surrounding organs.

Terminology English: Urogenital diaphragm
Synonym: Triangular ligament

: Diaphragma urogenitale
Definition The urogenital diaphragm is a strong muscular sheet occupying the area between the symphysis pubis and ischial tuberosities.
Function Assists in micturition, provides support and protection to surrounding organs

Learn more about the peritoneum and its relations in the following study unit:

Urogenital diaphragm: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more.

Kim Bengochea Kim Bengochea, Regis University, Denver
© Unless stated otherwise, all content, including illustrations are exclusive property of Kenhub GmbH, and are protected by German and international copyright laws. All rights reserved.

Register now and grab your free ultimate anatomy study guide!