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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).
Definition of ventricular. : of, relating to, or being a ventricle ventricular fibrillation ventricular pressure ventricular myocardium.