The obturator membrane is a thin fibrous sheet, which almost completely closes the

obturator foramen The obturator foramen (Latin foramen obturatum) is the large opening created by the ischium and pubis bones of the pelvis through which nerves and blood vessels pass. Structure It is bounded by a thin, uneven margin, to which a strong membran ...

. Its fibers are arranged in interlacing bundles mainly transverse in direction; the uppermost bundle is attached to the

obturator tubercle Obturator may refer to: Medicine Anatomical structures * Obturator foramen * Obturator fascia * Obturator canal * Obturator vessels (disambiguation) ** Obturator artery ** Obturator veins * Obturator nerve ** Anterior branch of obturator ner ...

s and completes the

obturator canal The obturator canal is a passageway formed in the obturator foramen by part of the obturator membrane and the pelvis. It connects the pelvis to the thigh. Structure The obturator canal is formed between the obturator membrane and the pelvis. Th ...

for the passage of the obturator vessels and nerve. The membrane is attached to the sharp margin of the obturator foramen except at its lower lateral angle, where it is fixed to the pelvic surface of the inferior ramus of the

ischium The ischium () form ...

, i. e., within the margin. Both obturator muscles are connected with this membrane.

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