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 lesion exhibited a prevalent respiratory-type component similar to that of a normal eustachian tube, even though it was located in a posterior position in the tympanic cavity and distant from the middle ear opening of the tube itself.
CT detected no signs of osseous atresia or changes in the tympanic cavity or ossicles.
According to Sade, what we consider to be a case of idiopathic hemotympanum is actually a case of granular mastoiditis in which a cholesterol granuloma dominates the pathologic picture; it appears in the tympanic cavity and imparts a steel-blue color to the drum.
Computed tomography (CT) of the posterior nasal space and temporal bone demonstrated opacification of the right tympanic cavity and a noticeable fluid level.
A severely retracted atrophic drum was adherent to the medial wall of the tympanic cavity.
Treatment of cochlear tinnitus with dexamethasone infusion into the tympanic cavity.
On high-resolution CT, the artery can be seen entering the tympanic cavity through an enlarged tympanic canaliculus or a dehiscent carotid plate anteriorly and across the cochlear promontory.