The Physiology of the Eustachian Tube—Film

Abstract

The normal tubal function is quantitatively evaluated on a film at varied controlled pressure changes inside and outside the middle—ear cavity. The methods for such determinations are based on recordings of the movements of the intact ear drum. The aim is to show that such measurements performed during the conditions defined, give possibilities of determining the volume of the air—filled ear space, the elastic properties of the tympanic membrane, the events during changing ambient pressure or during the act of opening the tube.