Floor Of Fourth Ventricle Anatomy

Lesions may also arise outside the ventricle and secondarily extend into this chamber including medullary tectal and cerebellar hemispheric masses.

Floor of fourth ventricle anatomy.

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. 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. In the pontine part of floor of fourth ventricle following features are seen. The floor of the fourth ventricle is also referred to as the rhomboid fossa because of its shape.

The superior pontine part of the floor begins at the aqueduct and expands to the lower margin of the cerebellar peduncles. The upper triangular part is formed by the posterior surface of the pons. 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 glistening white floor of the fourth ventricle is the posterior surface of the brain stem fig.

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 lies within the brainstem at the junction between the pons and medulla oblongata. The floor of fourth ventricle is divided into two symmetrical halves by the median sulcus. Each half is further subdivided by sulcus limitans into a medial area called medial eminence and lateral vestibular area.

Central spinal canal bathes the spinal cord. From the 4th ventricle the fluid drains into two places. It s divisible into 2 parts. Tumors of the fourth ventricle commonly originate from the following structures composing the floor.

The sidewalls are formed by the veli and cerebellar peduncles. 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 is the last in the system it receives csf from the third ventricle via the cerebral aqueduct. The obex is the most caudal tip of the fourth ventricle.

It is widest at the level of the pontomedullary junction. The ependyma choroid plexus and tela choroidea. Hydrocephalus is classified as noncommunicating and communicating based on whether all ventricular and subarachnoid spaces are communicating. The floor of the 4th ventricle is composed by the posterior surface of the pons and the upper part of the medulla.