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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).
Along with the structures known as the third ventricle and the fourth ventricle, the lateral ventricles are part of the body's ventricular system.he separate sections of the ventricular system are connected through small holes known as foramina. The lateral and third ventricles connect through the right and left interventricular foramina, while the third and fourth ventricles connect through a foramen known as the cerebral aqueduct.