The document describes the ventricular system of the brain, including: 1) It is comprised of the lateral ventricles, third ventricle, cerebral aqueduct, and fourth ventricle. 2) Cerebrospinal fluid is produced by the choroid plexus and circulates through the ventricles before being reabsorbed into the venous sinuses. 3) The lateral ventricles are located within the cerebral hemispheres and have anterior, body, and posterior horns.