<prompt> Cavity of mesencephalonLateral ventricleFouh ventricleCerebral acqueductThird ventricle  <response>: The cavity of mesencephalon forms the cerebral aqueduct.The cavity of Rhombencephalon forms the fouh ventricle.The cavity of prosencephalon forms lateral and third ventricle.Ref: Vishram Singh textbook of clinical neuroanatomy second edition pg 4 