Interpeduncular cistern

Interpeduncular cistern, also known as cisterna interpeduncularis or the intercrural cistern, is a cone-shaped cistern located in the interpeduncular fossa. It is bounded at the front by the sella turcica, pituitary stalk, and the optic chiasm. The cistern’s roof is formed by the lower surface of the mesencephalon, the lower part of the diencephalon, and the mammillary bodies. The inferior boundary of interpeduncular cistern is determined by the medial and lateral pontomesencephalic membranes. Superiorly, the cistern connects with the chiasmatic cistern.

Inside the interpeduncular cistern, you can find the peduncular segments of the posterior cerebral and superior cerebellar arteries. Additionally, it contains the thalamogeniculate arteries, medial and lateral posterior choroidal arteries, the basal vein of Rosenthal, and the oculomotor nerve.