Eustachian tube
The tube that runs from the middle ear to the pharynx. The function of the Eustachian tube is to protect, aerate and drain the middle ear (and mastoid). Occlusion of the Eustachian tube leads to the development of middle ear inflammation (otitis media). The Eustachian tube is also called the otopharyngeal tube (because it connects the ear to the pharynx) and the auditory tube (and in Latin, the tuba acustica, tuba auditiva, and tuba auditoria). The pharynx is subdivided into 3 parts: the upper part called the nasopharynx, the middle part called the oropharynx, and the lower part called the hypopharynx. The Eustachian tube opens into the nasopharynx. The Eustachian tube measures only 17-18mm and is horizontal at birth. As it grows to double that length, it grows to be at an incline of 45 degrees in adulthood so that the nasopharyngeal orifice (opening) in the adult is significantly below the tympanic orifice (the opening in the middle ear near the ear drum). The shorter length and the horizontality of the Eustachian tube in infancy protects the middle ear poorly, makes for poor drainage of fluid from the middle ear, and predisposes infants and young children to middle ear infection. The greater length and particularly the slope of the tube as it grows serves more effectively to protect, aerate and drain the middle ear. The Eustachian tube in the adult is opened by two muscles (the tensor palati and the levator palati) but the anatomy of children permits only one of these muscles (the tensor palati) to work. This is a particular problem for children born with cleft palate who have poor function of that muscle; they suffer from Eustachian tube and middle ear problems until the second muscle (the levator palati) begins to function. The tube serves to adjust the pressure of the air within the middle ear to that of ambient air. It is harder to get air into the middle ear than get it out, which is why we have more trouble with our ears when a plane is descending than when it takes off. The tube bears the name of Bartolomeo Eustachi, a 16th-century (c. 1500-1510 to 1574) Italian physician. In 1562 and 1563 he produced a remarkable series of treatises on the kidney, the teeth, and the ear. These were published in Opuscula anatomica (1564). The treatise on the kidney was the first work specifically dedicated to that organ. He was the first to study the teeth in any detail. The treatise on the ear, the auditory organ (De auditus organis), provided a correct account of the auditory tube that is still referred to by his name. In 1552 Eustachi prepared a series of 47 anatomical plates, which (although they were published long after his death) alone assured him a distinguished position in the history of anatomy. He placed anatomy in the service of medicine. With Vesalius and Fallopio (of Fallopian tube fame), Eustachi is often seen as one of the three heroes of human anatomy. (Historical information based on the Catalog of the Scientific Community of the 16th and 17th Centuries by Richard S Westfall for the Galileo Project.)

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eustachian tube n, often cap E a bony and cartilaginous tube connecting the middle ear with the nasopharynx and equalizing air pressure on both sides of the tympanic membrane called also auditory tube, pharyngotympanic tube

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the tube that connects the middle ear to the pharynx. It allows the pressure on the inner side of the eardrum to remain equal to the external pressure.
B. Eustachio (1520-74), Italian anatomist

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tuba auditiva.

Medical dictionary. 2011.

Look at other dictionaries:

  • eustachian tube — [yo͞o stā′shən, yo͞ostā′shē ən, yo͞ostā′kē ən] n. [after Bartolommeo Eustachio (1520 74), It anatomist] [also E t ] a slender tube between the middle ear and the pharynx, which serves to equalize air pressure on both sides of the eardrum: see… …   English World dictionary

  • Eustachian tube — so called for Italian physician Bartolomeo Eustachio (d.1574), who discovered the passages from the ears to the throat. His name is from L. Eustachius (see EUSTACE (Cf. Eustace)) …   Etymology dictionary

  • Eustachian tube — ► NOUN Anatomy ▪ a narrow passage leading from the pharynx to the cavity of the middle ear, permitting the equalization of pressure on each side of the eardrum. ORIGIN named after the Italian anatomist Bartolomeo Eustachio (died 1574) …   English terms dictionary

  • Eustachian tube — Infobox Anatomy Name = Eustachian tube Latin = tuba auditiva GraySubject = 230 GrayPage = 1042 Caption = Anatomy of the human ear. Caption2 = MapPos = Eustachian Tube MapCaption = The middle ear Precursor = first branchial pouch System = Artery …   Wikipedia

  • eustachian tube — 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 …   Aviation dictionary

  • Eustachian tube — /yooh stay sheuhn, stay kee euhn/, Anat. a canal extending from the middle ear to the pharynx; auditory canal. See diag. under ear1. [1735 45; named after EUSTACHIO; see AN] * * * ▪ anatomy also called  Auditory Tube,         tube that extends… …   Universalium

  • Eustachian tube — UK [juːˌsteɪʃ(ə)n ˈtjuːb] / US [juˌsteɪʃ(ə)n ˈtub] noun [countable] Word forms Eustachian tube : singular Eustachian tube plural Eustachian tubes medical one of the two tubes in your body that connect your ears to your throat and control the air… …   English dictionary

  • Eustachian tube — Eustachijaus vamzdis statusas T sritis fizika atitikmenys: angl. Eustachian tube vok. Eustachische Röhre, f; Ohrtrompete, f rus. евстахиева труба, f pranc. trompe d’Eustache, f …   Fizikos terminų žodynas

  • eustachian tube — Eu·sta·chi·an tube || juː steɪʃjÉ™n (Anatomy) auditory tube, thin tube connecting the middle ear to the pharynx (helps equalize internal and external pressure on the eardrum) …   English contemporary dictionary

  • Eustachian tube — /juˈsteɪʃən tjub / (say yooh stayshuhn tyoohb) noun a canal extending from the middle ear to the pharynx; auditory canal. {Eustachian, from Bartolommeo Eustachio, died 1574, Italian anatomist + an} …   Australian English dictionary

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