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Encyclopedia > Inner ear
Inner ear
The cochlea and vestibule, viewed from above.
Latin auris interna
Gray's subject #232 1047
Artery labyrinthine artery
MeSH Inner+ear
Inner ear
Inner ear

The inner ear is the bony labyrinth, a system of passages comprising two main functional parts: Image File history File links Gray923. ... The cochlea is the auditory portion of the inner ear. ... This is a page about the part of the ear. ... Image File history File links Bony_labyrinth. ... The posterior semicircular canal, vertical like the superior, is directed backward, nearly parallel to the posterior surface of the petrous bone; it is the longest of the three canals, measuring from 18 to 22 mm. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... The utricle, larger than the saccule, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. ... The lateral or horizontal canal (external semicircular canal) is the shortest of the three canals. ... This is a page about the part of the ear. ... The cochlea is the auditory portion of the inner ear. ... Categories: Stub ... For other uses, see Latin (disambiguation). ... Section of an artery For other uses, see Artery (disambiguation). ... The labyrinthine artery (auditory artery, internal auditory artery), a long slender branch of the basilar artery, arises from near the middle of the artery; it accompanies the acoustic nerve through the internal acoustic meatus, and is distributed to the internal ear. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Image File history File links Gray920. ... Image File history File links Gray920. ... For other uses, see Ear (disambiguation). ... For more uses of the word labyrinth, see Labyrinth (disambiguation) The labyrinth is a system of fluid passages in the inner ear, including both the cochlea which is part of the auditory system, and the vestibular system which provides the sense of balance. ...

Inner ears are found in all vertebrates, with substantial variations in the form and function of their sensory organs. Each animal has two inner ears, one on each side of its head. The cochlea is the auditory portion of the inner ear. ... inner ear illustration showing semicircular canal, hair cells, ampulla, cupula, vestibular nerve, & fluid The semicircular canals are three half-circular, interconnected tubes located inside each ear that are the equivalent of three gyroscopes located in three planes perpendicular (at right angles) to each other. ... This is a page about the part of the ear. ...

Contents

Ear overview, in context

In mammals, the outer ear focuses and directs sound waves into the middle ear. In the middle ear, the energy of these pressure waves[1] is translated into mechanical vibrations of the middle ear’s bone structure. The cochlea of the inner ear propagates these mechanical signals as waves in fluid and membranes, and finally transduces them to nerve impulses which are transmitted to the brain. The outer ear is the external portion of the ear. ... The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the cochlea. ... Plane P-wave Representation of the propagation of a P-wave on a 2d grid (empirical shape) One of the two types of elastic body waves (named because they travel through the body of the Earth) that are produced by earthquakes and recorded by seismometers. ...


The vestibular system of the inner ear is responsible for the sensations of balance and motion. It uses the same kinds of fluids and detection cells (hair cells) as the cochlea uses, and sends information to the brain about the attitude, rotation, and linear motion of the head. The type of motion or attitude detected by a hair cell depends on its associated mechanical structures, such as the curved tube of a semicircular canal or the calcium carbonate crystals (otolith) of the saccule and utricle. It has been suggested that Equilibrioception be merged into this article or section. ... Hair cells are the sensory cells of the auditory system that are found within the cochleas organ of Corti. ... An otolith, or otoconium is a [[[calcium]] carbonate structure in the saccule or utricle of the inner ear (hence the name otolith, or ear-stone). It can be used for age determination, showing rings of different growth summer/winter, like tree rings. ... Categories: Stub ... The utricle, larger than the saccule, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. ...


The inner ear is innervated by the eighth cranial nerve in all vertebrates. Cranial nerves are nerves which start directly from the brainstem instead of the spinal cord. ...


Non-humans

Birds have an auditory system similar to that of mammals, including an outer ear, middle ear, and cochlea, though their middle ear has only one bone compared to the three bones in mammals. Reptiles, amphibians, and fish do not have cochleas but hear with simpler auditory organs or vestibular organs, which generally detect lower-frequency sounds than the cochlea.


References

  1. ^ http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l1c.html

See also

For more uses of the word labyrinth, see Labyrinth (disambiguation) The labyrinth is a system of fluid passages in the inner ear, including both the cochlea which is part of the auditory system, and the vestibular system which provides the sense of balance. ... It has been suggested that Equilibrioception be merged into this article or section. ... The cochlea is the auditory portion of the inner ear. ...

External links


  Results from FactBites:
 
Middle & Inner Ear Infections in Cats (594 words)
The symptoms for middle and inner ear infections are often similar to outer ear infections and include pain in the ear, head shaking, infected or bloody discharge, and scratching or pawing at the head or ear.
Middle and inner ear infections are diagnosed with a thorough otoscopic exam and x-rays of the head.
A ruptured eardrum or an eardrum that is discolored and bulging with fluid is an indicator of a middle and possibly inner ear infection.
Autoimmune Inner Ear Disease (432 words)
Autoimmune inner ear disease (AIED) is an inflammatory condition of the inner ear.
The vibrations are passed to the small bones of the middle ear, which transmit them to the hearing nerve in the inner ear.
The inner ear is also capable of producing an autoimmune response to sensitized cells that can enter the cochlea through the circulatory system.
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