Floor Of Fourth Ventricle Anatomy

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.

Floor of fourth ventricle anatomy. The floor of the fourth ventricle is also referred to as the rhomboid fossa because of its shape. This ventricle has a roof and a floor. Each half is further subdivided by sulcus limitans into a medial area called medial eminence and lateral vestibular area. 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 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 obex is the most caudal tip of the fourth ventricle. The ependyma choroid plexus and tela choroidea. Central spinal canal bathes the spinal cord.

In the pontine part of floor of fourth ventricle following features are seen. It s divisible into 2 parts. 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 floor of the 4th ventricle is composed by the posterior surface of the pons and the upper part of the medulla.

The fourth ventricle is the last in the system it receives csf from the third ventricle via the cerebral aqueduct. The superior pontine part of the floor begins at the aqueduct and expands to the lower margin of the cerebellar peduncles. From the 4th ventricle the fluid drains into two places. It lies within the brainstem at the junction between the pons and medulla oblongata.

The glistening white floor of the fourth ventricle is the posterior surface of the brain stem fig. It is widest at the level of the pontomedullary junction. The sidewalls are formed by the veli and cerebellar peduncles. Hydrocephalus is classified as noncommunicating and communicating based on whether all ventricular and subarachnoid spaces are communicating.

The border between the pons and medulla occurs approximately at the level of the foramina of luschka. The floor of fourth ventricle is divided into two symmetrical halves by the median sulcus. 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. Tumors of the fourth ventricle commonly originate from the following structures composing the floor.