<prompt> Scala tympani and vestibuli is drained by:Aqueduct of cochleaPerilymphatic ductEnolymphatic ductCochlear ly mphatics  <response>: Ans: B Perilymphatic duct Ref: Grays Anatomy 40th EdExplanation:Perilymph:It fills the bony labyrinth scala tympani scala vestibuleIt is similar to CSFIt is drained by perilymphatic duct into the adjoining subarachnoid spaceEndolymph:It fills the membranous labyrinthHas high K and low Na similar to intracellular fluidIt is produced by specialized cells in the wall of cochlear ductIt is drained via endolymphatic duct 