<prompt> Cerebral aqueduct Duct of Sylvius - which is true:3 cms in lengthConnects III. ventricle to IV ventricleConnects III. ventricle to IV ventricleConnects two lateral ventricles  <response>: B i.e., Connects HI ventricle to IV ventricle- Rhomboid fossa or floor of 4th ventricle has abducent motor nucleus, dorsal motor nucleus of vagus, hypoglossal nucleus, and facial nucleus.- 4th ventricle communicates through cerebral aqueduct of sylvius with 3rd ventricle. 