Which of the following is not a derivative of the middle ear cleft-: (A) Semicircular canal, (B) Mastoid aircell, (C) Tympanic cavity, (D) Eustachian tube
Answer is A. Ans. is 'a' i.e., Semicircular canal o The middle - ear cleft in the temporal bone includesEustachian tubeThe middle ear (tympanic cavity)Aditus wrhich leads posteriorly to the mastoid antrum and air cells.