Tympanic Cavity


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Related to Tympanic Cavity: tympanic membrane, round window, Eustachian tube

tympanic cavity

[tim′pan·ik ′kav·əd·ē]
(anatomy)
The irregular, air-containing, mucous-membrane-lined space of the middle ear; contains the three auditory ossicles and communicates with the nasopharynx through the auditory tube.

Tympanic Cavity

 

a cavity in the middle ear of terrestrial animals and man. It develops from the cavity of the first gill slit. It has become lost in caudate and legless amphibians and burrowing snakes. The tympanic cavity is located between the tympanic membrane, the bony labyrinth of the inner ear, and one or more cranial bones; it contains the auditory ossicles. The tympanic cavity is filled with air and communicates with the pharyngeal cavity via the auditory or Eustachian tube. In some terrestrial vertebrates, especially mammals, the tympanic cavity enlarges and its functions intensify because of the formation of eardrums and additional auditory cavities in the adjacent parts of the cranium. The development of cancellous bone in these parts helps to make “spatial hearing” more acute, especially in aquatic and subterranean animals. The connection of the tympanic cavity to resonance chambers attuned to the sound frequencies most important in the life of animals increases the selective sensitivity of the organ of hearing.

G. N. SIMKIN

References in periodicals archive ?
The muscles surrounding tympanic cavity were opposed together with Alles tissue forcep and sutured with Catgut number 0.
According to some authors, endoscopy of middle ear is the best way to explore the tympanic cavity and to understand the importance of ventilation roots, because disturbance of ventilation roots are the most important factors for initiation of pathology in the middle ear.
Tos and Lau divided cholesteatoma into three groups as follows; (I) Attic cholesteatoma, originating in a retraction (perforation) of shrapnel's membrane and extending to the attic from where it spreads to the aditus and antrum; (2) Sinus cholesteatoma, originating in a postero-superior retraction of the pars tensa (perforation) and spreading to the tympanic sinus and medial to the incus and malleus up toward the attic; and (3) tensa retraction of the entire pars tensa, lining all walls of the tympanic cavity and spreading medially to the anterior and posterior malleus folds toward the attic.
In order to simplify the extent of cholesteatoma, the middle ear and mastoid space are divided into four sites: difficult access sites (S), tympanic cavity (T), attic (A), and mastoid (M).
The normal tympanic cavity is covered with a single layered and flattened or cuboidal respiratory epithelium, and it does not contain any glandular tissue.
8) Merrick reported metastatic involvement of the left tympanic cavity in a patient who had undergone a hemicolectomy for an adenocarcinoma of the descending colon 6 years earlier.
This cleft in the posterior tympanic cavity is often the subject of attention because it is visually obscure, it has a tendency to be involved with cholesteatoma, and there is no straightforward surgical approach to it.
Occasionally the tympanic cavity may become filled with granulation tissue and may erode into mastoid cavity as it happened in the present case.
Examination detected a reddish-blue vascular mass behind the tympanic membrane that filled the postero-superior part of the right tympanic cavity (figure 1).
High resolution computed tomography provides excellent of bony land marks within the temporal bone, due to the temporal bone inherent contrast, its dense bone being surrounded by air of the tympanic cavity and mastoid air cells.
1 instruments tympanic cavity to drain the middle ear, of the type II of polytetrafluoroethylene (PTFE) having a diameter of 1.
1) Numerous causes have been proposed to explain the etiology of these aberrations; among them are the absence of a carotid canal (2) and the persistence of embryonic vasculature that may pull the ICA into the tympanic cavity.