<prompt> Which of the following is not a derivative of the middle ear cleft ?Semicircular canalMastoid air cellTympanic cavityEustachian tube  <response>: 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. 