Floor Forth Ventricle

It is 1 5 cm long and 1 2 mm in diameter.

Floor forth ventricle.

The obex is also a. The fourth ventricle contains cerebrospinal fluid. The cerebral aqueduct is a narrow canal in the midline connecting the third and fourth ventricle. The only naturally occurring openings between the ventricles of the brain and the subarachnoid space surrounding the brain are the foramina of luschka and magendie in the fourth ventricle.

Its floor is formed by the tegmentum of the midbrain. The floor of the fourth ventricle the rhomboid fossa see fig. The fourth ventricle has an anterior ventral floor with a characteristic diamond shape named the rhomboid fossa and a posterior dorsal tent shaped roof. It has a diamond shape and is located in the upper portion of the medulla.

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. 10 3 is formed by the pons and medulla fig. The caudal tip of the fourth ventricle where it becomes the central canal is known as the obex. Specifically it spans from the obex an area in the medulla.

It is a non specific sign of a pontine mass or process with mass effect but in children is most frequently seen.