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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).
All the four ventricles of the human brain develop from the central canal of the embryonic neural tube, usually during the first trimester of pregnancy. All the ventricles, the lateral, the third, and the fourth ventricle, are joined to one another.hey are known as, lateral ventricles, third ventricle, and fourth ventricle. There are two lateral ventricles, known as right and the left ventricle, which are located within the cerebral hemisphere. The lateral ventricles are the largest ventricles of the brain.