<prompt> Which of the followig is a derivative of otic capsule?Membraneous labyrinthPerilymphatic labyrinthBony labyrinthOssicles  <response>: Ans. isci.e., Bony labyrinthRef Dhingra 4he p. 86; Langmann 317Otic capsule or the bony labyrinth ossifies from 14 centres, the first one appears in the region of cochlea at 16 weeks and the last one appears in the postero lateral pa of posterior semicircular canal at 20d week 