Floor Of Fourth Ventricle Anatomy

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.

Floor of fourth ventricle anatomy. The glistening white floor of the fourth ventricle is the posterior surface of the brain stem fig. Central spinal canal bathes the spinal cord. The ependyma choroid plexus and tela choroidea. The fourth ventricle outlet obstruction fvoo is a rare but well established cause of obstructive tetra ventricular hydrocephalus characterizing with dilatation or large cerebrospinal fluid collection of the foramen of magendie and foramen of luschka.

The floor of the fourth ventricle is also referred to as the rhomboid fossa because of its shape. In the pontine part of floor of fourth ventricle following features are seen. It is divisible into a right and left half by the posterior median sulcus and into a superior and inferior triangle by the striae medullares. The fourth ventricle is the last in the system it receives csf from the third ventricle via the cerebral aqueduct.

The floor located ventrally is formed by the rhomboid fossa a diamond shaped depression on the dorsal surface of the pons and upper half of the medulla. It is widest at the level of the pontomedullary junction. Its rhomboid in shape diamond shaped and as a result of its shape the floor of the 4th ventricle is usually referred to as rhomboid fossa. The floor of fourth ventricle is divided into two symmetrical halves by the median sulcus.

The obex is the most caudal tip of the fourth ventricle. From the 4th ventricle the fluid drains into two places. This ventricle has a roof and a floor. It lies within the brainstem at the junction between the pons and medulla oblongata.

The floor of the 4th ventricle is composed by the posterior surface of the pons and the upper part of the medulla. Hydrocephalus is classified as noncommunicating and communicating based on whether all ventricular and subarachnoid spaces are communicating. Tumors of the fourth ventricle commonly originate from the following structures composing the floor. The border between the pons and medulla occurs approximately at the level of the foramina of luschka.

The superior pontine part of the floor begins at the aqueduct and expands to the lower margin of the cerebellar peduncles. Lesions may also arise outside the ventricle and secondarily extend into this chamber including medullary tectal and cerebellar hemispheric masses. The roof is composed of the cerebellum located at the back of the brain and the floor is formed by the rhomboid fossa a depression in the brainstem. It s divisible into 2 parts.