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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).
There are two types chambers of the heart, called the ventricles and the atria (singular is atrium). Each side of the heart has one ventricle and one atrium, and most people make a common mistake of assuming that the ventricles sit atop the atria. In fact the reverse is true. Each ventricle is located below an atrium.here are two types chambers of the heart, called the ventricles and the atria (singular is atrium). Each side of the heart has one ventricle and one atrium, and most people make a common mistake of assuming that the ventricles sit atop the atria. In fact the reverse is true. Each ventricle is located below an atrium.