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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 ventricles are the pumping chambers'. The atria are the receiving chambers of the heart. The ventricles, the right ventricle pumps blood to the lungs through the pulmonary artery (the only artery that carries deoxygenated blood). The left ventricle pumps blood to the rest of the body through the Aorta.