interpeduncular fossa

It is located in the mesencephalon below the interpeduncular fossa.

Between the peduncles is the interpeduncular fossa, which is a cistern filled with cerebrospinal fluid.

The central branches supply the interior of the Circle of Willis, more specifically, the Interpeduncular fossa.

It encloses the cerebral peduncles and the structures contained in the interpeduncular fossa, and contains the arterial circle of Willis.

The interpeduncular fossa is a somewhat rhomboid-shaped area of the base of the brain, limited in front by the optic chiasma, behind by the antero-superior surface of the pons, antero-laterally by the converging optic tracts, and postero-laterally by the diverging cerebral peduncles.

The basal vein passes backward around the cerebral peduncle, and ends in the internal cerebral vein (vein of Galen); it receives tributaries from the interpeduncular fossa, the inferior horn of the lateral ventricle, the hippocampal gyrus, and the mid-brain.