Corpus: Obturator membrane

The Membrana obturatoria is a thin, fibre-rich connective tissue membrane that almost completely closes the foramen obturatum.

With the exception of the inferolateral angle, the fibres of the membrane attach to the sharp edge of the foramen obturatum between the os pubis and the os ischii and overlap like a scissor lattice. However, they predominantly run in a transverse direction.

In the cranial part of the membrane, the fibre tracts attach to the obturator tuberosity anterius and posterius and, together with the obturator sulcus, form the obturator canal. The blood vessels of the same name and the accompanying nerve from the small pelvis run through it to the thigh.

The obturator membrane serves as the origin for the external obturator muscle and the internal obturator muscle.