I. Introduction
Tympanic membrane is a thin, oval, and translucent structure that separates the external ear from the middle ear. It is approximately O.lmm thick, 8-10mm in diameter and lies at an angle of 45 degree to the horizontal axis. The sound waves traveling from the outer ear strike the tympanic membrane causing it to vibrate. This vibration is then transmitted by the tympanic membrane into the inner ear. The tympanic membrane has three layers, outer, inner, and middle layer. The outermost layer of the tympanic membrane is a continuation of the ear canal skin. The innermost layer is in continuation of the mucous membrane lining the middle ear and the middle layer consists of radial and circular fibers giving the tympanic membrane its stiffness and tension. The internal surface and the external surface of the tympanic membrane are convex and concave respectively.