![]() It is closed under normal conditions and opens temporarily. The main relations are: the intrapetrous carotid, the tensor tympani muscle, the middle cerebral fossa and temporo-mandibular joint. ![]() The bony portion (protympanum), explored by computed tomography, is cone shaped, with a posterior base. Tumors that impair/occlude the ET or that invade the tensor veli palatini to impair normal swallow regulation can also lead to dysfunction. The Eustachian tube (ET) is the connection between the middle ear and nasopharyngeal space. The auditory tube is a bony and cartilaginous canal which connects the middle ear to the nasopharynx.The upper end of the eustachian tube is narrow and surrounded by bone. In adults, paradoxical closing of the ET with swallowing occurs in a majority of affected patients. It is directed downward and inward from the tympanic cavity, or middle ear, to the portion of the pharynx called the nasopharynx (the space above the soft palate and behind and continuous with the nasal passages).Adenoid hypertrophy can block the torus tubarius (proximal opening of the ET).In children, a horizontal and shorter ET predisposes to difficulties with ventilation and drainage.Infection of static fluid causes edema and release of inflammatory mediators, exacerbating the cycle of inflammation and obstruction.Serous exudate is drawn to the middle ear by negative pressure or refluxed into the middle ear if the ET opens momentarily. The auditory tube (tuba auditiva Eustachian tube) is the channel through which the tympanic cavity communicates with the nasal part of the pharynx.Its length is about 36 mm.Proper eustachian tube function helps maintain overall ear health. Protect your middle ear from pathogens (microorganisms that cause disease). Ventilate your middle ear and equalize air pressure on either side of your eardrum. They: Drain excess fluids and secretions from your middle ear. ![]() Negative pressure develops in middle ear. Your eustachian tubes have three primary functions.Cycle of dysfunction: structural or functional obstruction of the ET:.ET is closed at rest and opens with yawning, swallowing, and chewing.Protection from nasopharyngeal secretions.Ventilation/regulation of middle ear pressure.ETD is failure of the ET, palate, nasal cavities, and nasopharynx to regulate middle ear and mastoid pressure.Under normal circumstances, the ET is closed, opening to release a small amount of air to equilibrate middle ear pressure with surrounding atmospheric pressure.
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