Workshops This Weekend! Join Frank Gaillard, Miranda Siemienowicz and Andrew Dixon at RANZCR 2021 Virtual - free for All-Access Pass holders FIND OUT MORE

Obturator foramen

Last revised by Assoc Prof Craig Hacking on 24 Nov 2020

The obturator foramen is the large, obliquely oriented, ovoid aperture located at the anterior aspect of both sides of the pelvis, bounded by parts of the ischium and pubis. It is covered by thin fibrous membrane, the obturator membrane, which is covered on the internal and external surfaces by the muscles obturator internus and obturator externus respectively. At its superior margin, the membrane is devoid forming the obturator canal which allows the obturator nerve, artery and vein to exit the pelvis and enter the medial compartment of the thigh.

  • superior: superior pubic ramus and inferior margin of the acetabulum
  • anterior: pubic body
  • inferior: ischiopubic ramus (inferior pubic ramus)
  • posterior: ischiopubic ramus (inferior pubic ramus) and acetabulum

It is larger and more oval in males, whereas it is smaller and more triangular in females.

Although uncommon, an obturator hernia can pass through the foramen and cause bowel obstruction.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: obturator membrane (Gray's illustration)
    Drag here to reorder.
  • Figure 2: bony pelvis (illustrations)
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.