The median part of the superior roof called the superior medullary velum consists of a thin lamina of white matter between the cerebellar peduncles.
Roof 4th ventricle.
The upper portion of the roof is formed by 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 fourth ventricle has an anterior ventral floor with a characteristic diamond shape named the rhomboid fossa and a posterior dorsal tent shaped roof.
The roof of ventricle is diamond shaped and can be divided into superior and inferior parts.
Just behind its outer surface is the lingula the.
The obex is also a.
It corresponds to the ventral surface of the cerebellum.
The caudal tip of the fourth ventricle where it becomes the central canal is known as the obex.