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. The middle-ear cleft in the temporal bone includesEustachian tubeThe middle ear (tympanic cavity)Aditus which leads posteriorly to the mastoid antrum and air cellsRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 5