required to equalize the pressure between the middle ear and the ambient atmosphere as the plane descends. A diver also experiences this change in pressure, but with greater rates of pressure change; active opening of the Eustachian tube is required more frequently to equalize pressure as the diver goes deeper, into higher pressure.

Structure

The Eustachian tube extends from the anterior wall of the middle ear to the lateral wall of the nasopharynx,

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