tympanic membrane

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tympanic membrane

the thin translucent oval membrane separating the external ear from the middle ear. It transmits vibrations produced by sound waves, via the ossicles, to the cochlea
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tympanic Membrane

 

eardrum, a thin layer of connective tissue and epithelium covering the opening of the tympanic cavity in the ear of terrestrial vertebrates and man. The tympanic membrane is absent in caudate and legless amphibians and burrowing snakes. Sound waves on striking the membrane cause it to vibrate. The vibrations are then transmitted to the inner ear mostly by the auditory ossicles. The membrane is divided into three concentric zones in mammals and man because of the uneven action of forces on some of its parts: medial (which moves without becoming deformed), intermediate (the most delicate and strongly vibrated), and lateral (hinged, movable).

G. N. SIMKIN

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

tympanic membrane

[tim′pan·ik ′mem‚brān]
(anatomy)
The membrane separating the external from the middle ear. Also known as eardrum; tympanum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The rats in both the groups were decapitated on the 21st day, and their tympanic membranes were removed, followed by histopathological examinations.
The postoperative tympanic membrane morphology, average of pure-tone hearing thresholds and average air-bone gap were used as the indices for evaluating therapeutic effects.
The purposes of closing chronic dry perforations of the tympanic membrane are to improve hearing and prevent middle ear infections.
I'm not talking about the situation in which one physician has seen a normal tympanic membrane at 4 in the afternoon and at 7 in the morning the same ear has drained.
Temporalis fascia remains the most commonly used material for tympanic membrane reconstruction, with a success rate of 93% to 97% in primary tympanoplasties.
The study's results also showed good reproducibility of the tympanic membrane severity scores assigned by four physicians and two physician assistants, said Dr.
(3) The primary factors that are involved in the healing of tympanic membrane perforations appear to be platelet-derived growth factor, epidermal growth factor, fibroblast growth factor, and transforming growth factor.
By increasing the tension on the tympanic membrane, they improve the high-frequency transmission of sound through the eardrum and middle ear.
(3) Silent otitis media was first described in 1980 by Paparella et al, who coined the term to describe infection and inflammation that persists in the mastoid and the middle ear behind the normal tympanic membrane. (3) Masked mastoiditis is considered to be a component of silent otitis media.
All three patients had had defects in their tympanic membranes, and all had used a combination gentamicin/betamethasone product that is available in Canada and is the most commonly prescribed ototopical agent in Europe.
Otologists regularly observe and treat retracted (atelectatic) tympanic membranes (figure 1).

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