Cisternae and Vessels of the Pituitary and Diencephalon

Abstract

The spaces within which the cerebrospinal fluid circulates are bounded on the brain side by the pia mater and on the external side by the arachnoid. The pia mater consists essentially of collagen fibers and is everywhere closely apposed to the brain surface. In certain regions this layer of fibers is particularly thick (medulla oblongata, pons, optic nerves, chiasma, etc.). In other zones it is usually thinner (superolateral, medial and inferior surfaces of the hemispheres).