[The topographic anatomy of the interpeduncular cistern and endoscopic ventriculocisternostomy in the region of the bottom of the third ventricle].

The interpeduncular cistern was microanatomically studied on 14 anatomic specimens of the brain. It was divided into 2 parts: superficial (free) and deep (vascular). The upper interpeduncular cistern wall was divided into hypothalamic and mesencephalic parts. The interpeduncular cistern is connected with the ambient, pretontine, carotid, cerebellopontine, oculomotor, and peduncular cisterns. It is a composite space-occupying, structural formation. Liliequist's membrane is the basic membranous component of a cistern. The proposed division makes it possible to study different parts of the interpeduncular cistern qualitatively and quantitatively and to define clear topographic and anatomic criteria as a guideline in this field.