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The middle ear is exposed to atmospheric pressure only through the _______

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The middle ear is exposed to atmospheric pressure only through the _______

(a) eustachian tube

(b) tympanic membrane

(c) pinna

(d) auditory nerve

The question was posed to me in quiz.

My doubt is from Mechanism of Hearing in chapter Audiometry of Biomedical Instrumentation

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Right option is (a) eustachian tube

Easiest explanation: The middle ear is exposed to atmospheric pressure only through the eustachian tube, which connects it to the pharynx and nose or mouth. The sound energy from the tympanic membrane is transmitted through the cavity of the middle ear, to the receptor cells in the inner ear, which are surrounded by fluid. The tympanic membrane separates the ear canal from the middle ear cavity.

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