Anatomy Of The Floor Of The Fourth Ventricle
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The upper triangular part is formed by the posterior surface of the pons.
Anatomy of the floor of the fourth ventricle. The floor of fourth ventricle is also known as rhomboid fossa whi. It s divisible into 2 parts. Medial eminence is bounded laterally by sulcus limitans. Lateral to sulcus limitans.
Inside the brain there are four cavities called ventricles. It lies within the brainstem at the junction between the pons and medulla oblongata. Features of the floor of fourth ventricle median sulcus. It is formed by the dorsal surface of pons and upper open part of the medulla.
Fourth ventricle location shown in red e pons b. It rises up and backwards forming two walls called the roof of the 4th ventricle which converge into a summit located in the anterior part of the cerebellar vermis fig. The right and left lateral ventricles and the third and fourth ventricles compose the ventricular system. Posteroinferiorly it connects with the fourth ventricle through the cerebral aqueduct of sylvius.
Overlies the vestib ular nuclei hence it is termed vestibular area. It communicates superolaterally with the first and second ventricles through the interventricular foramen of monro. 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. Like other ventricles the third ventricle has a cavity an anterior wall a posterior wall a floor a roof and two lateral walls.
The 4th ventricle is in the form of a spread and irregular cone whose base or floor is supported on the dorsal side of the brainstem. Central spinal canal bathes the spinal cord. The floor of fourth ventricle is diamond shaped and is also known as rhomboid fossa. From the 4th ventricle the fluid drains into two places.
Superior fovea upper end of sulcus limitans widens into a triangular depression. The fourth ventricle contains. The floor of the ventricle is to the right the roof to the left 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 video demonstrates the external features of pons and the floor of the fourth ventricle.
The fourth ventricle is the last in the system it receives csf from the third ventricle via the cerebral aqueduct.
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