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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).
The Ventricular System. Within the brain there are four ventricles: two lateral (meaning away from the midline of the body), a third ventricle near the center of the brain and the fourth ventricle under the cerebellum. They are all connected by smaller passageways that allow the CSF to circulate slowly among them.