What structure assists in the change of pressure in the middle ear?

The Eustachian tube plays a crucial role in regulating the pressure within the middle ear. This tube connects the middle ear to the nasopharynx and is responsible for equalizing air pressure on either side of the tympanic membrane (eardrum). When you swallow or yawn, the Eustachian tube opens briefly, allowing air to flow into or out of the middle ear space to harmonize pressure with the external environment. This function is essential for maintaining proper hearing and preventing discomfort that can occur when pressure differences develop, such as during altitude changes or airplane travel.

The tympanic membrane, while significant in sound transmission and serving as a barrier between the outer and middle ear, is not directly involved in pressure regulation. The cochlea and semicircular canals are primarily associated with the functions of hearing and balance, respectively, rather than pressure equalization in the middle ear. Thus, the Eustachian tube is the correct structure that assists in managing pressure changes in this specific area of the ear.