Corpus: Interpeduncular cistern

The cisterna interpeduncularis is a cerebrospinal fluid-filled extension of the subarachnoid space in the CNS. It belongs to the cerebrospinal fluid cisterns and is part of the posterior basal cistern.

The interpeduncular cistern lies on the basal surface of the midbrain in the area of the two cerebral peduncles (pedunculi cerebri) and the interpeduncular fossa. The corpora mamillaria protrude into the cisterna interpeduncularis and the oculomotor nerve runs through it.