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The ventricles are cavities within the brain that are filled with cerebrospinal fluid (CSF). This fluid circulates through the brain and spinal cord, providing a protective cushion and aiding in the removal of waste products.12

The ventricular system includes a pair of lateral ventricles, a third ventricle, and a fourth ventricle. Most of the CSF is produced by the choroid plexus, a network of blood vessels located in the walls of the lateral ventricles.13

An accumulation of CSF within the ventricles can lead to a condition called hydrocephalus, which causes increased pressure within the skull and can lead to brain damage if not treated. This blockage can occur within the ventricles or outside of them.45

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