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Encyclopedia > Labyrinth (inner ear)
Labyrinth (inner ear)
Latin labyrinthus vestibularis
Gray's subject #232 1047
Artery labyrinthine artery
MeSH Labyrinth
Dorlands/Elsevier l_01/12474346
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 is named by analogy with the mythical maze that imprisoned the Minotaur, because of its appearance. Image File history File links Balance_Disorder_Illustration_A.png balance disorder image from public domain http://www. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... 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. ... Elseviers logo. ... Meanings of Labyrinth: In Greek mythology, the Labyrinth was an elaborate maze constructed for King Minos of Crete. ... The inner ear comprises both: the organ of hearing (the cochlea) and the labyrinth or vestibular apparatus, the organ of balance located in the inner ear that consists of three semicircular canals and the vestibule. ... The cochlea is the auditory branch of the inner ear. ... The auditory system is the sensory system for the sense of hearing. ... It has been suggested that Equilibrioception be merged into this article or section. ... Equilibrioception or sense of balance is one of the physiological senses. ...


The vestibule is the region of the inner ear where the semicircular canals converge, close to the cochlea (the hearing organ). The vestibular system works with the visual system to keep objects in focus when the head is moving. Joint and muscle receptors also are important in maintaining balance. The brain receives, interprets, and processes the information from these systems that control our balance. This is a page about the part of the ear. ... It has been suggested that Equilibrioception be merged into this article or section. ...


Pathology

Interference with or infection of the Labyrinth can result in a syndrome of ailments called Labyrinthitis. The symptoms of Labrynthitis include temporary nausea, disorientation, vertigo, and dizziness. Labyrinthitis can be caused by viral infections, bacterial infections, physical blockage of the inner ear, or due to decompression sickness. balance disorder that usually follows an upper respiratory tract infection (URI). ... Decompression sickness (DCS), the diver’s disease, the bends, or caisson disease is the name given to a variety of symptoms suffered by a person exposed to a reduction in the pressure surrounding their body. ...


Anatomical details

Top image is antero-lateral and bottom image is postero-medial. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ...

  1. Lateral semicircular canal; 1’, its ampulla;
  2. Posterior canal; 2’, its ampulla.
  3. Superior canal; 3’, its ampulla.
  4. Conjoined limb of superior and posterior canals (sinus utriculi superior).
  5. Utricle. 5’. Recessus utriculi. 5”. Sinus utriculi posterior.
  6. Ductus endolymphaticus.
  7. Canalis utriculosaccularis.
  8. Nerve to ampulla of superior canal.
  9. Nerve to ampulla of lateral canal.
  10. Nerve to recessus utriculi (in top image, the three branches appear conjoined). 10’. Ending of nerve in recessus utriculi.
  11. Facial nerve.
  12. Lagena cochleæ.
  13. Nerve of cochlea within spiral lamina.
  14. Basilar membrane.
  15. Nerve fibers to macula of saccule.
  16. Nerve to ampulla of posterior canal.
  17. Saccule.
  18. Secondary membrane of tympanum.
  19. Canalis reuniens.
  20. Vestibular end of ductus cochlearis.
  21. Section of the facial and acoustic nerves within internal acoustic meatus (the separation between them is not apparent in the section).

The lateral or horizontal canal (external semicircular canal) is the shortest of the three canals. ... The ampulla of Vater is a sphincter (a small muscle) where the common bile duct enters the duodenum. ... The posterior semicircular canal, vertical like the superior, is directed backward, nearly parallel to the posterior surface of the petrous bone. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... Otolith organ Utricle is also a fruit type, found in beet and dock. ... From the posterior wall of the saccule a canal, the endolymphatic duct, is given off; this duct is joined by the ductus utriculosaccularis, and then passes along the aquaeductus vestibuli and ends in a blind pouch (saccus endolymphaticus) on the posterior surface of the petrous portion of the temporal bone... The facial nerve is seventh of twelve paired cranial nerves. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... The cochlear nerve (also auditory nerve) is part of the vestibulocochlear nerve, (or 8th cranial nerve) that is found in higher vertebrates. ... Cross section of the cochlea. ... Categories: Stub ... The tympanic membrane, colloquially known as the eardrum, is a thin membrane that separates the external ear from the middle ear. ... From the lower part of the saccule a short tube, the canalis reuniens of Hensen, passes downward and opens into the ductus cochlearis near its vestibular extremity. ... The cochlear duct (or scala media) is an endolymph filled cavity inside the cochlea, located in between the scala tympani and the scala vestibuli, separated by the basilar membrane and Reissners membrane (the vestibular membrane) respectively. ... Near the center of the posterior surface of the temporal bone is a large orifice, the internal acoustic meatus (or internal auditory meatus), the size of which varies considerably; its margins are smooth and rounded, and it leads into a short canal, about 1 cm. ...

See also


  Results from FactBites:
 
X. The Organs of the Senses and the Common Integument. 1d. 4. The Internal Ear or Labyrinth. Gray, Henry. 1918. Anatomy ... (4443 words)
It is called the labyrinth, from the complexity of its shape, and consists of two parts: the osseous labyrinth, a series of cavities within the petrous part of the temporal bone, and the membranous labyrinth, a series of communicating membranous sacs and ducts, contained within the bony cavities.
On the inner side of the inner rods is a single row of hair cells, and on the outer side of the outer rods three or four rows of similar cells, together with certain supporting cells termed the cells of Deiters and Hensen.
—The arteries of the labyrinth are the internal auditory, from the basilar, and the stylomastoid, from the posterior auricular.
  More results at FactBites »

 
 

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