ethmoid labyrinth

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the inner ear, consisting of the vestibule, cochlea, and semicircular canals. The cochlea is concerned with hearing and the vestibule and semicircular canals with the sense of equilibrium. (See also color plates.) adj., adj labyrin´thine. 

The bony portion of the labyrinth (osseous labyrinth) is composed of a series of canals tunneled out of the temporal bone. Inside the osseous labyrinth is the membranous labyrinth, which conforms to the general shape of the osseous labyrinth but is much smaller. A fluid called perilymph fills the space (perilymphatic space) between the osseous and membranous labyrinths. Fluid inside the membranous labyrinth is called endolymph. These fluids play an important role in the transmission of sound waves and the maintenance of body balance. The membranous labyrinth is divided into two parts: the cochlear labyrinth, which includes the perilymphatic space and the cochlear duct, and the vestibular labyrinth, which includes the utricle, saccule, and semicircular canals.

Disorders of the inner ear, such as labyrinthitis and meniere's disease, are characterized by episodes of dizziness, tinnitus, and hearing loss.
ethmoid labyrinth (ethmoidal labyrinth) either of the paired lateral masses of the ethmoid bone, consisting of numerous thin-walled cellular cavities, the ethmoidal cells.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

eth·moid lab·y·rinth

(eth'moyd lab'i-rinth)
A mass of air cells with thin bony walls forming part of the lateral wall of the nasal cavity; the cells are arranged in three groups, anterior, middle, and posterior, and are closed laterally by the orbital plate, which forms part of the wall of the orbit.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
(3) In addition, the ethmoid roof may be at different levels on the right and left sides (i.e., the distance between the highest level of the ethmoid labyrinth and cribiform plate ranges from 0.6 to 11.7 mm, and the distance from the floor of the nasal cavity to the cribiform plate ranges from 38 to 52 mm).
The polypoid tissue was removed, and the ethmoid labyrinth was found to have more polypoid tissue.
In 1939, Van Alyea described pneumatization of the superior turbinate in his study of the ethmoid labyrinth in 100 midsagittal cadaveric specimens.
Cells that are part of the anterior ethmoid labyrinth drain into the middle meatus, and cells that belong to the posterior ethmoid labyrinth drain into the superior meatus and occasionally into the supreme meatus.