“…The Liliequist membrane presents a sellar portion implanted in the dorsum sellae, which in turn is subdivided into posterior projection, in a diencephalic portion and a mesencephalic portion 1,2,4 . The diencephalic portion has close contact with the ependymal layer and extends to the mammillary bodies, and the mesencephalic portion has a posterior inferior projection, surrounding the mesencephalon 3,5,6 .…”