ENT Ear 0dfddde1 Infection of CNS spreads to inner ear through A Cochlear aqueduct B Endolymphatic sac C Vestibular aqueduct D Hyle fissure High-Yield Explanation The scala tympani is closed by a secondary tympanic membrane. It is also connected with subarachnoid space through aqueduct of cochlea Reference: Dhingra 6th edition.