What allows pressure in middle to equalize with atmospheric pressure?
The Eustachian tube, nowadays known as the pharyngotympanic tube. THis structure connect the middle ear to the oropharnx allowing the air from outside into the inner ear, equalizing pressure and so reducung stress on the tympanic membrane.The tube is only open when the person is swallowing and this is why chewing gums on descending and ascending planes helps ears to "pop".
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