Question #476
The obturator foramen
The obturator foramen is located between the superior and inferior pelvic rami. It is bordered by the ischium and pubic bones only.
The foramen is almost completely filled by the obturator membrane. A small aperture is left anteriorly, the obturator canal, through which
the obturator nerve and vessels pass to enter the lower limb.
The female obturator foramen is oval compared to the male where it is round.
Obturator internus lies on the medial surface of the membrane and almost completely covers the foramen.
Obturator externus lies on the lateral surface of the membrane with fibres arising from the medial edge of the foramen.