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