Eustachian tube

Eustachian tube

The Eustachian tube, also known as the auditory tube or pharyngotympanic tube, is a tube that links the pharynx to the middle ear. In humans and other land vertebrates, the Eustachian tube equalizes the pressure in the middle ear with the pressure in the atmosphere outside the body.

Function

The primary function of the Eustachian tube is to ventilate the middle ear space, ensuring that its pressure remains at near normal ambient air pressure. The secondary function of the Eustachian tube is to drain any accumulated secretions, infection, or debris from the middle ear space. Several small muscles located in the back of the throat and palate control the opening and closing of the tube.

Anatomy

The Eustachian tube is approximately 35 mm long. It is named after the sixteenth-century anatomist Bartolomeo Eustachi.

Clinical significance

Dysfunction of the Eustachian tube may lead to otitis media, or inflammation of the middle ear. Symptoms may include ear pain, ringing in the ears (tinnitus), and hearing loss, which can be temporary or permanent.

See also

• Otitis media
• Tinnitus
• Middle ear
• Pharynx

References

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External links

• WikiMD article on Eustachian tube

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