tympanic cavity

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Related to tympanic cavity: tympanic membrane, round window, Eustachian tube


1. a hollow or space, or a potential space, within the body or one of its organs; called also caverna and cavum.
2. the lesion produced by dental caries.
Cavities in the body. From Applegate, 2000.
abdominal cavity the cavity of the body between the diaphragm above and the pelvis below, containing the abdominal organs.
absorption c's cavities in developing compact bone due to osteoclastic erosion, usually occurring in the areas laid down first.
amniotic cavity the closed sac between the embryo and the amnion, containing the amniotic fluid.
cranial cavity the space enclosed by the bones of the cranium.
glenoid cavity a depression in the lateral angle of the scapula for articulation with the humerus.
marrow cavity (medullary cavity) the cavity that contains bone marrow in the diaphysis of a long bone; called also medullary canal.
nasal cavity the proximal portion of the passages of the respiratory system, extending from the nares to the pharynx; it is divided into left and right halves by the nasal septum and is separated from the oral cavity by the hard palate.
oral cavity the cavity of the mouth, bounded by the jaw bones and associated structures (muscles and mucosa).
pelvic cavity the space within the walls of the pelvis.
pericardial cavity the potential space between the epicardium and the parietal layer of the serous pericardium.
peritoneal cavity the potential space between the parietal and the visceral peritoneum.
pleural cavity the potential space between the two layers of pleura.
pulp cavity the pulp-filled central chamber in the crown of a tooth.
cavity of septum pellucidum the median cleft between the two laminae of the septum pellucidum. Called also pseudocele, pseudocoele, and fifth ventricle.
serous cavity a coelomic cavity, like that enclosed by the pericardium, peritoneum, or pleura, not communicating with the outside of the body and lined with a serous membrane, i.e., one which secretes a serous fluid.
tension cavity cavities of the lung in which the air pressure is greater than that of the atmosphere.
thoracic cavity the portion of the ventral body cavity situated between the neck and the diaphragm; it contains the pleural cavity.
tympanic cavity the major portion of the middle ear, consisting of a narrow air-filled cavity in the temporal bone that contains the auditory ossicles and communicates with the mastoid air cells and the mastoid antrum by means of the aditus and the nasopharynx by means of the auditory tube. The middle ear and the tympanic cavity were formerly regarded as being synonymous.
uterine cavity the flattened space within the uterus communicating proximally on either side with the fallopian tubes and below with the vagina.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

tym·pan·ic cav·i·ty

an air chamber in the temporal bone, medial to the tympanic membrane, between the external acoustic meatus and the inner ear containing the ossicles; it is lined with mucous membrane continuous with the pharyngotympanic tube anteriorly and the tympanic antrum and mastoid air cells posteriorly and bound by the tympanic membrane laterally.
Farlex Partner Medical Dictionary © Farlex 2012

tympanic cavity

A large, irregularly shaped cavity of the middle ear.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

tym·pan·ic cav·i·ty

(tim-pan'ik kav'i-tē) [TA]
An air chamber in the temporal bone containing the ossicles; it is lined with mucous membrane and is continuous with the auditory tube anteriorly and the tympanic antrum and mastoid air cells posteriorly.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(kav'it-e) [L. cavitas, hollow]
A hollow space, such as a body organ or the hole in a tooth produced by caries.

abdominal cavity

The ventral cavity between the diaphragm and pelvis, containing the abdominal organs. It is lined with a serous membrane, the peritoneum, and contains the following organs: stomach with the lower portion of the esophagus, small and large intestines (except sigmoid colon and rectum), liver, gallbladder, spleen, pancreas, adrenal glands, kidneys, and ureters. It is continuous with the pelvic cavity; the two constitute the abdominopelvic cavity. See: abdomen; abdominal quadrants for illus.

alveolar cavity

A tooth socket.

articular cavity

The synovial cavity of a joint.
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body cavity

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1. Any hollow space within the body. See: illustration
2. A hidden body space that is accessible from the outside, e.g., rectum or vagina. Referred to in “body cavity search for contraband”.
3. Derivatives of the coelom, i.e., the pericardial, peritoneal, and plural sacs. See: coelom

buccal cavity

Oral cavity.

cotyloid cavity


cranial cavity

The cavity of the skull, which contains the brain.

dental cavity


dorsal cavity

The body cavity composed of the cranial and spinal cavities. See: body cavity for illus.

glenoid cavity

Glenoid fossa (2).

joint cavity

The articular cavity or space enclosed by the synovial membrane and articular cartilages. It contains synovial fluid. Synonym: joint space

laryngeal cavity

The hollow inside the larynx from its inlet at the laryngopharynx to the beginning of the trachea. It has three segments (from top to bottom): vestibule of the larynx, ventricle of the larynx, infraglottic cavity.

lesser peritoneal cavity

Omental bursa.

medullary cavity

The marrow-filled space in a bone.

nasal cavity

One of two cavities between the floor of the cranium and the roof of the mouth, opening to the nose anteriorly and the nasopharynx posteriorly. Its lining of ciliated epithelium warms and moistens inhaled air, and traps dust and pathogens on mucus that are then swept toward the pharynx. The nasal septum (ethmoid and vomer) separates the nasal cavities, and the olfactory receptors are in the upper part of each cavity. The paranasal sinuses (frontal, maxillary, sphenoidal, and ethmoidal) open into the meatus below the conchae. The orifices of the frontal, anterior ethmoidal, and maxillary sinuses are in the middle meatus. The orifices of the posterior ethmoidal and sphenoidal sinuses are in the superior meatus. The nasal mucosa is highly vascular; blood is supplied by the maxillary arteries from the external carotid arteries and by the ethmoidal arteries from the internal carotid arteries.

oral cavity

The space inside the teeth and gums that is filled by the tongue when the mouth is closed and relaxed.
Synonym: buccal cavity

pelvic cavity

The bony hollow formed by the innominate bones, the sacrum, and the coccyx. The major pelvic cavity lies between the iliac fossae and above the iliopectineal lines. The minor pelvic cavity lies below the iliopectineal lines. See: pelvis

pericardial cavity

The potential space between the epicardium (visceral pericardium) and the parietal pericardium.
See: pericardia friction rub; pericarditis

peritoneal cavity

The potential space between the parietal peritoneum, which lines the abdominal wall, and the visceral peritoneum, which forms the surface layer of the visceral organs. It contains serous fluid.

pleural cavity

The potential space between the parietal pleura that lines the thoracic cavity and the visceral pleura that covers the lungs. It contains serous fluid that prevents friction.

pleuroperitoneal cavity

The ventral body cavity.
See: body cavity for illus.; coelom

pulp cavity

The cavity in a tooth containing blood vessels and nerve endings.

resonating cavities

The anatomic intensifiers of the human voice, including the upper portion of the larynx, pharynx, nasal cavity, paranasal sinuses, and oral cavity.

Rosenmüller cavity

See: Rosenmüller, Johann Christian

serous cavity

The space between two layers of serous membrane (e.g., the pleural, pericardial, and peritoneal cavities).

spinal cavity

The cavity that contains the spinal cord. See: body cavity for illus.

splanchnic cavity

Any of the cavities of the body, such as the cranial, thoracic, and abdominal cavities, that contain important organs.
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thoracic cavity

The part of the ventral cavity above the diaphragm, the domed muscle that separates it from the abdominal cavity; it is enclosed by the chest wall. The thoracic viscera include the pleural membranes that surround the lungs, the mediastinum between the lungs, which contains the heart and pericardial membranes, the thoracic aorta, pulmonary artery and veins, vena cavae, thymus gland, lymph nodes, trachea, bronchi, esophagus, and thoracic duct. See: illustration

tympanic cavity

Middle ear.

uterine cavity

The hollow space inside the body of the uterus.

ventral cavity

The body cavity composed of the thoracic, abdominal, and pelvic cavities. See: body cavity for illus.

visceral cavity

The body cavity containing the viscera (i.e., the thorax, abdomen, and pelvis).
Medical Dictionary, © 2009 Farlex and Partners

tympanic cavity

see EAR.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

tym·pan·ic cav·i·ty

(tim-pan'ik kav'i-tē) [TA]
An air chamber in the temporal bone, medial to the tympanic membrane, between the external acoustic meatus and the inner ear containing the ossicles.
Synonym(s): cavity of middle ear.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Understanding the physiological conditions of the blood supply in the auditory ossicles and the tympanic cavity is the crucial first step in preventing complications in middle ear surgery.
Initially, on the head CT scans, diminished aeration of the mastoid air cells and tympanic cavity without bone destruction was described.
In the second classification, Extension of the cholesteatoma was evaluated in terms of isolated parts as well, tympanic cavity (oval window, round window, hypotympan, sinus tympani, and facial recess), mastoid (tegmen tympani, lateral semicircular canal, sinodural angle, and internal auditory canal.) and Eustachian tube (Table-III).
Within this family, he mentioned three well differentiated groups according to the relative size of the tympanic cavity: i- species with no-evident hypertrophied bullae (mean bullar hypertrophy index between 4.80 and 9.09 %), that live in wet environments; iispecies with moderately hypertrophied bullae (mean index between 10.47 and 12.59 %), that range in their distribution from semi humid to semi arid biotopes; and iii- species with evidently hypertrophied bullae (mean index between 14.38 and 17.28), that are typical inhabitants of arid and semi-arid environments.
Incus lesion was the most common finding during surgeries (30 cases), of which the lenticular process or the distal part of the long process was destructed in 23 cases, and fixation was identified in 7 cases due to a bony fixation of the body or due to adhesions between the long process and the medial wall of the tympanic cavity. Involvement of the stapes was found in 17 cases, of which the superstructure was destructed in 1 case; immobility due to adhesions in the oval window niche was found in 12 cases, whereas fixed footplate was detected in 4 cases.
CT scan was rechecked and showed soft tissue in the right mastoid and tympanic cavity, with an irregular osteolytic area involving tympanic cavity, zygomatic root, and zygomatico temporal junction [Figure 1]b.
After the injection of adrenalinic solution and local anesthetic under the skin of the posterior wall of the EAC, a wide tympanomeatal flap was created by a posterior semicircular incision on the skin of the EAC and elevated to gain an optimal view of the anatomical structures in the tympanic cavity. To obtain optimal access to the upper part of the tympanic cavity, an atticotomy with diamond burr was performed.
The retrotympanic spaces is a complex structure lying in the posterior aspect of the tympanic cavity. Four spaces present in retrotympanum, two of them lying in medial and anterior and two spaces lying lateral and posterior to the vertical part of facial nerve and pyramid.
On otoscopy, a whitish retrotympanic mass was seen occupying the posteroinferior portion of the tympanic cavity in the left ear (figure 1).
Computed tomography (CT) revealed a pervasive soft tissue shadow in the left middle ear cavity and thinning of the bony wall in front of the tympanic cavity (Figure 3a, b).
Chronic suppurative otitis media has been traditionally described as a chronic inflammation of part or the entire tympanomastoid compartment comprising of Eustachian tube, the tympanic cavity, the mastoid antrum and all the pneumatized spaces of temporal bone associated with perforation of the tympanic membrane and otorrhoea.