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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 lateral ventricles are the largest of the four ventricles. The ventricles are chambers in the core of the brain and brainstem that are filled with a watery substance called cerebrospinal fluid (CSF).The ventricles are the red structures in the picture below.he sketch below is the inside of the right half of the brain with the head facing to the left. The corpus callosum can be seen in the center of the brain. The corpus callosum is a communication link between the left and right hemispheres of the brain that forms the roof of the lateral ventricles.