This short video can be used to revise the ventricular system of the brain speedily. The video starts with the overview of the ventricular system. Lateral ventricles, third ventricle, and the fourth ventricle are described concisely. The connection between the ventricles is also demonstrated. The function of the cerebrospinal fluid is highlighted. The clinical relevance relates the obstruction of the ventricular system or raised intracranial pressure with the manifestations of the insult. 0:08 Overview 2:02 Cerebrospinal fluid 0:51 Ventricles 0:53 Lateral ventricles 1:02 Third ventricle 1:21 Fourth ventricle 1:47 Clinical correlation