Csf produced and or flowing into the fourth ventricle can exit to the subarachnoid space through lateral apertures and a single median aperture located in the inferiorportion of the roof.
Roof 4th ventricle.
The roof of fourth ventricle is the dorsal surface of the fourth ventricle.
The median part of the superior roof called the superior medullary velum consists of a thin lamina of white matter between the cerebellar peduncles.
The roof of the fourth ventricle is tent shaped rising to an apex called the fastigium that divides the superior roof from the inferior roof.
The roof of ventricle is diamond shaped and can be divided into superior and inferior parts.
The upper portion of the roof is formed by the cerebellum.
It corresponds to the ventral surface of the cerebellum.
The fourth ventricle has a roof at its upper posterior surface and a floor at its lower anterior surface and side walls formed by the cerebellar peduncles nerve bundles joining the structure on the posterior side of the ventricle to the structures on the anterior side.
The caudal tip of the fourth ventricle where it becomes the central canal is known as the obex.