What is the primary function of the Eustachian tube?

The primary function of the Eustachian tube is to improve drainage and maintain air pressure in the middle ear. This tube connects the middle ear to the nasopharynx and plays a critical role in equalizing the air pressure between the middle ear and the external environment. When the pressure on either side of the eardrum becomes uneven, the Eustachian tube opens to allow air to flow in or out, ensuring that the pressure remains balanced. This function is essential for proper hearing and preventing discomfort that can arise from pressure changes, such as during altitude changes or airplane travel.

Other functions, such as protecting the inner ear from infections or regulating sound frequency, are linked to different structures and mechanisms within the auditory system. Therefore, while the Eustachian tube is involved in the overall health of the ear and can influence comfort and hearing, its main role is centered on pressure regulation and drainage.