Are all the ventricles of brain interconnected?

Yes, all the ventricles of the brain are interconnected. The brain has four main ventricles: the two lateral ventricles, the third ventricle, and the fourth ventricle. The lateral ventricles connect to the third ventricle via the interventricular foramen (foramen of Monro), while the third ventricle is connected to the fourth ventricle through the cerebral aqueduct (aqueduct of Sylvius). This interconnected system allows for the circulation of cerebrospinal fluid (CSF) throughout the brain and spinal cord.