middle ear

(redirected from middle ear cavity)
Also found in: Dictionary, Thesaurus, Medical.
Related to middle ear cavity: orbital cavity

middle ear

the sound-conducting part of the ear, containing the malleus, incus, and stapes

Middle Ear

 

in man and other terrestrial vertebrates, the part of the auditory system located between the external ear and the internal ear. The middle ear includes the air-filled tympanic cavity, which contains auditory ossicles and the auditory, or eusta-chian, tube. In man and some primates, it also includes mastoid cells. In most vertebrates, it is bounded on the outside by the tympanic membrane. The middle ear is separated from the internal ear by the cartilaginous or bony wall of the vestibule of the labyrinth. The auditory ossicles transmit sound vibrations from the tympanic membrane to the internal ear. In most animals, the middle ear is connected to the pharynx by the auditory tube. In many terrestrial vertebrates and especially in mammals it contains many additional structures that perform important acoustic functions. The middle ear is partly or completely reduced in many terrestrial and secondarily aquatic amphibians, in many mammals, and in some turtles and snakes.

middle ear

[′mid·əl ′ir]
(anatomy)
The middle portion of the ear in higher vertebrates; in mammals it contains three ossicles and is separated from the external ear by the tympanic membrane and from the inner ear by the oval and round windows.
References in periodicals archive ?
An extensive array of tumors can occur in the middle ear cavity which can cause CHL by interfering with normal ossicular movement.
2) Physical examination may detect some granulation or polyps over the external auditory canal, middle ear cavity, and/or mastoid area, similar to what is observed in chronic otitis media caused by common pathogens.
4,5) Inadvertent residual cholesteatoma is believed to occur as a result of poor visualization of areas in the middle ear cavity during the initial surgery.
Thus, it has the potential to be useful for preoperative evaluation of the middle ear cavity.
1-4,6,7) For example, lateral expansion and erosion of the posterior aspect of the petrous carotid canal wall, with or without hemorrhage, can involve the middle ear cavity and its structures.
Those external auditory canal cholesteatomas that occur as a complication of surgery or trauma are more likely than other forms to violate the middle ear cavity, and they commonly require surgical treatment.
If the pressure difference continues to increase, a transudate effusion begins to leak into the middle ear cavity.
This results in a disturbance of the continuous drainage of fluids from the middle ear cavity to the auditory tube, perforation of the tympanic membrane, and relapsing otorrhea.
High-resolution computed tomography (CT) of the temporal bones detected a diffuse soft-tissue lesion in the right middle ear cavity and mastoid antrum (figure 1, A).
With a 30 [degrees] otoscope, the middle ear cavity could be seen clearly through the perforation, and a close-up view showed most of its contents (figure, B).
2,3) CT will show an aberrant ICA as a tubular mass that can be followed as it crosses the middle ear cavity and joins the horizontal petrous ICA.