Library · Anatomy
Eustachian tube
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The eustachian tube is a small tube that connects the middle ear, the air chamber behind the eardrum, with the nasopharynx, the part of the throat just behind the nose. It is also called the auditory tube or the pharyngotympanic tube, and its job is to keep the internal environment of the middle ear in balance.
It opens up when pressure rises, as it does when you yawn, sneeze, or swallow, driven by the contraction of the palate muscles, the levator veli palatini and the tensor veli palatini.
It has three functions. With the tube open, middle ear pressure equalizes with the pressure in the nasopharynx: that is the pop you feel when you swallow on a plane. Its ciliated cells, the ones with tiny moving hairs, sweep secretions toward the throat, like a broom that always pushes toward the same exit. And a tube that works properly protects the middle ear from loud sounds and from pathogens.
Keeping that pressure balanced pays off directly: the eardrum maintains its optimal compliance, meaning it gives and vibrates the way it should, and that is how you hear well.
In brief
The eustachian tube, or pharyngotympanic tube, regulates the internal balance of the middle ear and opens into the nasopharynx.
It opens in response to positive pressure, with yawning, sneezing, or swallowing, through contraction of the levator and tensor veli palatini muscles.
A valve that pops open when you swallow.
It serves three functions: equalizing middle ear pressure, clearing secretions toward the nasopharynx with its ciliated cells, and protecting the middle ear from loud sounds and pathogens.
Keeping that pressure balanced optimizes eardrum compliance for hearing.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingEustachian Tube Dysfunction, StatPearlsPublished
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
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