Which structure prevents spread of infection form middle ear to brain ?: (A) Tegmen tympani, (B) Cribriform plate, (C) Fundus tympani, (D) Petrous apex
Answer is A. Ans. is 'a' i.e., Tegmen tympani Tegmen tympani (forming the roof of middle ear cavity) separates the tympanic cavity from middle cranial fossa.