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The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma. The ventricular system is composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct, and the fourth ventricle (see the following images).
There are two lateral ventricles- one on each side of the cerebral cortex. The lateral ventricles are continuous with the third ventricle, which is lower in the brain. The third ventricle is continuous with the fourth ventricle, which runs along the brainstem. The ventricles are all an important part of the âventricular system.â The ventricles are interconnected with each other, and also with the central canal of the spinal cord and with the subarachnoid space (a space between two of the linings that separate the brain from the skull).