Lateral ventricles are found in the Brain. The brain ventricles are four interconnected cavities located within the brain that contain cerebrospinal fluid (CSF). There are two lateral ventricles one on each side of the cerebral cortex. These lateral ventricles are continuous with the third ventricle present in the diencephalon between the two thalami. The ventricular system is continuous with the central canal of the spinal cord from the fourth ventricle.