Eustachian tube

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Eustachian tube

(yo͞ostā`shən) [for Bartolomeo EustachiEustachi, Bartolomeo
, d. 1574, Italian anatomist. He lived in Rome from 1549 and taught at the Collegia della Sapienza (later the Univ. of Rome). He described many structures in the human body, including the Eustachian tube of the ear, the adrenal glands, the thoracic duct, the
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], a hollow structure of bone and cartilage extending from the middle earear,
organ of hearing and equilibrium. The human ear consists of outer, middle, and inner parts. The outer ear is the visible portion; it includes the skin-covered flap of cartilage known as the auricle, or pinna, and the opening (auditory canal) leading to the eardrum (tympanic
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 to the rear of the throat, or pharynx, technically known as the pharyngotympanic or auditory tube. By permitting air to leave or enter the middle ear, the tube equalizes air pressure on either side of the eardrum. The tube can become blocked, as by enlarged adenoids or the mucous secretions of a cold, so that external and internal pressure become imbalanced. Earache and diminution of hearing may result. The tube may also serve as a pathway to the ear for infections of the throat. A common ear disease known as otitis media, usually appearing in early childhood, is thought to be related to the Eustachian tube. The tube tends to be shorter and more horizontal among children, factors which facilitate the spread of infections from upper respiratory diseases to the middle ear, as well as the accumulation of fluids in the region.

Eustachian Tube

 

auditory tube, in terrestrial vertebrates, the canal that unites the pharynx with the cavity of the middle ear; named for B. Eustachio, who first described it in 1563.

The eustachian tube serves to equalize the air pressure in the middle ear with that of the surrounding environment. It originates from the rudiment of the gill slit. In crocodiles it forms a complex system of anastomosing canals. It is absent in snakes because of the reduction of the middle ear.

In man, the eustachian tube is a tubular formation that unites the nasopharynx with the tympanic cavity of the middle ear. Air enters the tympanic cavity through the eustachian tube from the nasopharynx. When the eustachian tube is inflamed, the entry of air into the tympanic cavity often ceases or is limited, producing a sensation of noise and congestion in the ear; hearing is somewhat decreased.

eustachian tube

[yü′stā·shən ‚tüb]
(anatomy)
A tube composed of bone and cartilage that connects the nasopharynx with the middle ear cavity.

eustachian tube

eustachian tubeclick for a larger image
The Eustachian tube is normal in the case on the left. In the case on the right, it is blocked. The subject is likely to suffer from pain and injury in case he/she flies with sinus congestion resulting in the eustachian tube getting blocked.
The tube connecting the middle ear to the breathing passage. A person suffers from an earache if this tube is blocked and the aircraft is descending. The tube opens automatically and equalizes the pressure across the middle ear while climbing. It also opens during descent when a person swallows, yawns, or carries out the Valsalva maneuver. The eardrum can be perforated or damaged if the eustachian tube is blocked (as in congestion) and the aircraft descends rapidly. This is caused by the very high differential pressure inside the ear and the atmosphere. See also Valsava maneuver.

Eustachian tube

a tube that connects the middle ear with the nasopharynx and equalizes the pressure between the two sides of the eardrum
References in periodicals archive ?
A new method to evaluate the eustachian tube function.
Typical remedies include decongestants or nasal sprays, but these aren't specific to helping open the eustachian tubes and don't provide immediate relief.
The Eustachian Tube Dysfunction Questionnaire-7 (ETDQ-7) was used for the evaluation of ET symptoms [10].
A critical view of the acoustical measurement of the opening of the Eustachian tube.
(5) For the sake of our patients and colleagues, we have an obligation and the ability to avoid the tragedy of the commons with balloon eustachian tuboplasty and other new technologies.
When you have a cold, be sure to blow your nose gently so as not to inadvertently overcome the pressure differential of the Eustachian tubes and thus force mucus in the wrong direction.
Efficacy of balloon dilation in the treatment of symptomatic Eustachian tube dysfunction: One year follow-up study.
Repetition of TTE detected a reduction in the size of the vegetation, favoring the diagnosis of Eustachian valve endocarditis.
The most recent grand rounds concerning the topic of otitis media presented an excellent overview of anatomy and physiology of eustachian tube.
Failure to do so resulted in palatal and Eustachian tube dysfunction.
The pharyngeal opening of Eustachian tube was observed for its shape and size and following measurements were taken using sliding vernier calliper of 30 cm length, 0.01 cm accuracy as shown in Fig.1,2,3.
It's called this because the middle ear and eustachian tube fill up with a gungy, glue-like fluid.