<prompt> Shortest length of middle ear:2 mm4 mm6 mm1 cm  <response>: Ans. a 2 mmRef: Dhingras ENT 6th ed. 9-10 Length of middle ear canal: Epitympanum- 6mm Mesotympanum- 2mm Hypotympanum- 4mm Shortest distance between tympanic membrane to promontory: 2mm. 