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Ventricles of the brain

Learning objectives

After going through this study unit, you should be able to:

  1. Explain what is the ventricular system of the brain and its function.
  2. Describe the structures that comprise the ventricular system of the brain.

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The ventricles of the brain are an interconnected network of cavities filled with cerebrospinal fluid (CSF) located within the brain parenchyma. The ventricular system consists of the two lateral ventricles, the third ventricle, and the fourth ventricle. The choroid plexuses, located within each ventricle, produce CSF which fills the ventricles and subarachnoid space. This fluid cushions the brain and spinal cord from injury and also serves as a nutrient delivery and waste removal system for the brain.

Want to explore the ventricular system of the brain and the choroid plexus? Check out our videos below!

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Browse atlas

Review all the structures you learned today with the atlas gallery below.


Key points about the ventricles of the brain
Definition Interconnected cavities within the brain that produce and contain CSF
Function Protect the brain from injury
Nutrition of the brain and waste removal
Composition Lateral ventricles (2)
Third ventricle
Fourth Ventricle
Related structures Interventricular foramen (of Monro): lateral ventricles → third ventricle
Cerebral aqueduct (of Sylvius): third ventricle → fourth ventricle

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