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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).
Ventricles have thick muscular walls because they pump blood over great distances. Even though the right ventricle and the left ventricle act as two separate pumps that parellely eject equal volumes of blood, the right ventricle has a lesser workload.