Internal auditory meatus

Internal auditory meatus

Infobox Bone
Name = Internal auditory meatus
Latin = meatus acusticus internus
GraySubject = 34
GrayPage = 143


Caption = Left temporal bone. Inner surface.


Caption2 = Diagrammatic view of the fundus of the right internal acoustic meatus.
System =
MeshName =
MeshNumber =
DorlandsPre = m_06
DorlandsSuf = 12518154
The internal acoustic meatus (also internal auditory meatus) is a canal in the temporal bone of the skull that carries nerves from inside the cranium towards the middle and inner ear compartments.

tructure

The opening to the internal acoustic meatus is located inside the cranial cavity, near the center of the posterior surface of the temporal bone. The size varies considerably; its margins are smooth and rounded. The canal is short (about 1 cm) and runs laterally into the bone. At its end are the openings for three different canals, one of which is the facial canal.

Unlike the external acoustic meatus, the internal acoustic meatus does not transmit sound waves. It instead transmits the facial and vestibulocochlear nerves and the labyrinthine artery (an internal auditory branch of the basilar artery). The facial nerve travels through the facial canal, eventually exiting the skull at the stylomastoid foramen.

The opening of the meatus is called the porus acusticus internus, or its English translation, the internal acoustic opening.


=Additional

ee also

* External auditory meatus

References

*

External links

*
* (NormanAnatomyFig|VII)
* [http://www.uni-mainz.de/FB/Medizin/Anatomie/makro1/t112ii.htm Diagram of Porus acusticus internus]
* [http://www.bcm.edu/oto/studs/fn.html Diagram of Porus acusticus internus]


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Look at other dictionaries:

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  • internal auditory meatus — Anat. the canal extending through the petrous portion of the temporal bone, through which the glossopharyngeal nerve, the facial nerve, and the auditory nerve and artery pass. See diag. under ear. * * * …   Universalium

  • internal acoustic meatus — noun see internal auditory meatus …   Useful english dictionary

  • internal auditory canal — n a short auditory canal in the petrous portion of the temporal bone through which pass the facial and auditory nerves and the nervus intermedius called also internal acoustic meatus, internal auditory meatus * * * meatus acusticus internus …   Medical dictionary

  • Auditory meatus — can refer to: * external auditory meatus * internal auditory meatus …   Wikipedia

  • internal acoustic meatus — n INTERNAL AUDITORY CANAL …   Medical dictionary

  • auditory meatus — noun either of the passages in the outer ear from the auricle to the tympanic membrane • Syn: ↑acoustic meatus, ↑ear canal, ↑auditory canal, ↑external auditory canal • Hypernyms: ↑meatus • Part Holonyms: ↑ …   Useful english dictionary

  • Internal occipital crest — Bone: Internal occipital crest Occipital bone. Inner surface. (Internal occipital crest not labeled, but occipital sinus is visible at center.) …   Wikipedia

  • Meatus — In anatomy, a meatus is a natural body opening or canal (Latin, 4th declension pl. meatus, or meatuses often incorrectly meati). Examples include: the external acoustic meatus, the opening of the ear canal The internal auditory meatus, a canal in …   Wikipedia

  • auditory nerve — noun a composite sensory nerve supplying the hair cells of the vestibular organ and the hair cells of the cochlea • Syn: ↑acoustic nerve, ↑vestibulocochlear nerve, ↑nervus vestibulocochlearis, ↑eighth cranial nerve • Hypernyms: ↑cranial nerve …   Useful english dictionary

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