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In neuroanatomy, the ventricular system is a set of four interconnected cavities known as cerebral ventricles in the brain. [ 1 ] [ 2 ] Within each ventricle is a region of choroid plexus which produces the circulating cerebrospinal fluid (CSF).
Ventriculomegaly is a brain condition that mainly occurs in the fetus when the lateral ventricles become dilated. The most common definition uses a width of the atrium of the lateral ventricle of greater than 10 mm. [1] This occurs in around 1% of pregnancies. [2]
The volume of the lateral ventricles is enlarged in some neurological diseases, such as schizophrenia, [8] bipolar disorder, [9] major depressive disorder, [9] and Alzheimer's disease. [10] Ventriculomegaly is a brain condition that mainly occurs during development when the lateral ventricles become dilated. [11]
The ependymal lining of the ventricular system, the subarachnoid space, and the blood-brain-barrier forms the rest. [37] CSF flows through the ventricular system through the following pathway: [39] Lateral Ventricles → Interventricular Foramen of Monro → Third Ventricle → Cerebral Aqueduct → Fourth Ventricle
In the brain, the cavum veli interpositi (CVI) is a condition in which the cistern of the velum interpositum becomes dilated. The phenomenon usually occurs in newborns. Axial MR/CT show a triangular-shaped cerebrospinal fluid (CSF) space between the lateral ventricles.
Fourth ventricle location shown in red (E), pons (B); 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 enlarged skull of a person with hydrocephalus, which is a symptom of the excess CSF in the ventricular system. This may be caused by aqueductal stenosis, and in some cases, it is thought that hydrocephalus will cause aqueductal stenosis.
In the brain, the interventricular foramina (foramina of Monro) are channels that connect the paired lateral ventricles with the third ventricle at the midline of the brain. As channels, they allow cerebrospinal fluid (CSF) produced in the lateral ventricles to reach the third ventricle and then the rest of the brain's ventricular system.