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.


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.


ee also

* External auditory meatus



External links

* (NormanAnatomyFig|VII)
* [ Diagram of Porus acusticus internus]
* [ Diagram of Porus acusticus internus]

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Look at other dictionaries:

  • internal auditory meatus — noun also internal acoustic meatus : a short canal in the petrous portion of the temporal bone through which pass the facial, auditory, and glossopalatine nerves * * * Anat. the canal extending through the petrous portion of the temporal bone,… …   Useful english dictionary

  • 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 acoustic meatus — n INTERNAL AUDITORY CANAL …   Medical 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

  • 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

  • auditory meatus bony internal — m. acusticus internus …   Medical dictionary

  • auditory meatus internal — m. acusticus internus …   Medical dictionary

  • isthmus of external auditory meatus — a narrowing in the osseous part of the meatus about 2 cm from the internal end of the concha …   Medical dictionary

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