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The mucosa of the upper respiratory tract more than any other tissue is exposed to various infections coming from outside the body. The tympanic cavity, with the round and oval windows on its medial side, is a source of vulnerability to the inner ear. As the tympanic cavity is opened to all infections coming from the pharynx, one can see the importance of the very frequent lesions of the tympanic cavity in the pathology of the labyrinth. Moreover, the lesions of the middle ear may facilitate the fixation on the labyrinth of toxins or bacteria in circulation in the blood.
The authors have anteriorly shown that a unilateral lesion of the middle ear may in certain cases lower the bone conduction in the other ear and the air conduction for high-pitch sounds. In their book, the authors study the three ways by which the infections can reach the middle ear.
Infection tubo-tympanique et surdités labyrinthiques. AMA Arch Otolaryngol. 1955;62(4):456. doi:10.1001/archotol.1955.03830040110023
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