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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).
It's Megan from Kenhub here, and welcome to our tutorial about the ventricles of the brain. Before we start talking about the ventricles of the brain, let's first define the word ventricle. A ventricle is a hollow area or cavity within an organ usually filled with some kind of fluid. Our brain has four interconnected ventricles and the fluid that fills them is called cerebrospinal fluid.