The obturator fascia is the fascia of the obturator internus muscle which covers its internal surface and attaches to the bony margins of the obturator foramen.
Superomedially, the obturator fascia gives way to the obturator canal, allowing the obturator artery, vein and nerve to communicate between the pelvis and medial compartment of the thigh. It should not be confused for the obturator membrane which is located within the foramen, between the obturator externus and internus muscles 2.
On the surface of the obturator fascia, between the pubic body and ischial spine is a band-like thickening of the fascia, known as the tendinous arch of the levator ani, which forms part of the attachment for the levator ani muscles 1. There is some controversy of whether the tendinous arch is formed by the obturator fascia or endopelvic fascia, or whether both are just normal anatomical variations 3.
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