Obturator foramen

Dr Craig Hacking et al.

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 it's 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, where it is smaller and more triangular in females.

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

Abdominal and pelvic anatomy
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Article Information

rID: 51966
Section: Anatomy
Synonyms or Alternate Spellings:

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