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 ?
They cut the specimens horizontally with a thickness of 24 [micro]m per slice and analyzed them in an interval of 120 [micro]m or 240 [micro]m to evaluate the blood supply of the ossicles in the tympanic cavity.
New massive granulations in the anterior part of the tympanic cavity were observed.
The muscles surrounding tympanic cavity were opposed together with Alles tissue forcep and sutured with Catgut number 0.
Thus, the tympanic cavity and the ossicular chain can vibrate freely and function normally.
Our analysis of patients who underwent surgery shows the lack of significant improvement in bone conduction post-surgery in patients with tympanic cavity adhesions.
Surgical trauma to a dehiscent facial canal in the tympanic cavity may also lead to edema [1] and consequential paralysis of the facial nerve.
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.3 The results of clolesteatoma surgeries in log-term follow-up have been published; the recurrence rate of cholesteatoma was 17%.
However, both the character of the OC lesion and its potential relationship with the audiological outcomes in CSOM are relevant from a clinical point of view, especially in revision cases where the recurrent disease and the previous manipulation in the tympanic cavity could alter the pattern of ossicular involvement, leading to further mobility and/or fixation problems.
(30) However, as is the case with other office-based myringoplastyprocedures, exploration of the tympanic cavity cannot be performed during platelet-rich plasma placement, and the integrity and mobility of the ossicular chain cannot be tested.