Floor Of Fourth Ventricle Anatomy

The floor of fourth ventricle is divided into two symmetrical halves by the median sulcus.

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. The fourth ventricle is the last in the system it receives csf from the third ventricle via the cerebral aqueduct. The sidewalls are formed by the veli and cerebellar peduncles. The ependyma choroid plexus and tela choroidea.

Central spinal canal bathes the spinal cord. It lies within the brainstem at the junction between the pons and medulla oblongata. 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. The border between the pons and medulla occurs approximately at the level of the foramina of luschka.

The floor of the 4th ventricle is composed by the posterior surface of the pons and the upper part of the medulla. The upper triangular part is formed by the posterior surface of the pons. Lesions may also arise outside the ventricle and secondarily extend into this chamber including medullary tectal and cerebellar hemispheric masses. In the pontine part of floor of fourth ventricle following features are seen.

This ventricle has a roof and a floor. Tumors of the fourth ventricle commonly originate from the following structures composing the floor. The superior pontine part of the floor begins at the aqueduct and expands to the lower margin of the cerebellar peduncles. It is widest at the level of the pontomedullary junction.

The floor of the fourth ventricle is also referred to as the rhomboid fossa because of its shape. 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 glistening white floor of the fourth ventricle is the posterior surface of the brain stem fig. The obex is the most caudal tip of the fourth ventricle.

Hydrocephalus is classified as noncommunicating and communicating based on whether all ventricular and subarachnoid spaces are communicating. 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. Each half is further subdivided by sulcus limitans into a medial area called medial eminence and lateral vestibular area. 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.