<prompt> The cone of light is seen in which quadrant of tympanic membrane?AnterosuperiorAnteroinferiorPosterosuperiorPosteroinferior  <response>: Ans. b Anteroinferior. Ref Diseases of Ear, Nose and Throat, 6thpg. 71Tympanic membrane: It develops from all three germinal layers: ectoderm outer epithelial layer, mesoderm middle fibrous layer, and endoderm inner mucosal layer. The normal tympanic membrane is --pearlyshiny greyish white. The area of tympanic membrane is 90 sq. mm. and of stapes 3.5 sq mm. Out of 90 sq.mm area of the tympanic membrane, only 55 sq mm is functional. Normal tympanic membrane is mobile and the concavity on its lateral surface is more marked. At the tip of malleus--the umbo. Cone of light is seen in--anteroinferior quadrant. Attic area is pinkish lies above lateral process of malleus.Q.Ans.Cone of lightAnteroinferior quadrantMyingotomyPosteroinferior QuadrantGrommet insertionAnteroinferior QuadrantDirection of waterjet during syringingPostero superior 