<prompt> All of the following are true about the middle ear activity exceptRoof is formed by tegmen tympaniAnterior wall has opening of two canalsMedial wall is formed by tympanic membraneFloor has bulb of internal jugular vein  <response>: RELATIONS OF MIDDLE EAR: ROOF-Tegmen tympani FLOOR-Internal jugular vein ANTERIOR WALL-Internal carotid aery, canal for tensor tympani, tubal opening POSTERIOR WALL-Facial canal, aditus to antrum, MEDIAL WALL-Tympanic plexus, promontory, oval window, round window, pyramid LATERAL WALL-Tympanic membrane,chorda tympani nerve, incus, malleus Ref BDC volume 3,sixth edition 