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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/11/25 10:14:36」(JST)

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The internal auditory meatus (also meatus acusticus internus, internal acoustic meatus, internal auditory canal, internal acoustic canal, or IAC) is a canal within the petrous part of the temporal bone of the skull between the posterior cranial fossa and the inner ear.

Function

The internal auditory meatus provides a passage through which the vestibulocochlear nerve, the facial nerve, and the labyrinthine artery (an internal auditory branch of the basilar artery) can pass from inside the skull to structures of the inner ear and face.

It also contains the vestibular ganglion.

Structure

The opening to the meatus is called the porus acusticus internus, or its English translation, the internal acoustic opening. It is located inside the posterior cranial fossa of the skull, near the center of the posterior surface of the petrous part of the temporal bone. The size varies considerably; its margins are smooth and rounded.

The internal auditory meatus 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. The facial nerve travels through the facial canal, eventually exiting the skull at the stylomastoid foramen.

The antero-superior part transmits the facial nerve and nervus intermedius and is separated from the postero-superior section, which transmits the superior vestibular nerve, by Bill's bar (named by William F. House). The falciform crest or transverse crest separates the superior part from the inferior part. The cochlear nerve runs antero-inferiorly and the inferior vestibular nerve runs postero-inferiorly.

Additional images

Internal acoustic meatus
Temporal bone at birth. Inner aspect.
Base of the skull. Upper surface.
Horizontal section through left ear; upper half of section.
The cochlea and vestibule, viewed from above.
Tympanic cavity. Facial canal. Internal carotid artery.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Anatomy figure: 30:01-08 at Human Anatomy Online, SUNY Downstate Medical Center
cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (VII)
Diagram of Porus acusticus internus
Diagram of Porus acusticus internus

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English Journal

The nervus intermedius as a variable landmark and critical structure in cerebellopontine angle surgery: an anatomical study and classification.

Alfieri A, Fleischhammer J, Peschke E, Strauss C.SourceDepartment of Neurosurgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str., 40, 06120, Halle (Saale), Germany. alex.alfieri@medizin.uni-halle.de
Acta neurochirurgica.Acta Neurochir (Wien).2012 Jul;154(7):1263-8. Epub 2012 May 4.
BACKGROUND: An understanding of the normal topography during cerebellopontine angle surgery is necessary to obviate the anatomical distortions caused by tumors.OBJECTIVE: The aim of this study was to analyze the morphological features of the nervus intermedius (NI) and its related structures in the
PMID 22555552

The central myelin-peripheral myelin transitional zone of the nervus intermedius and its implications for microsurgery in the cerebellopontine angle.

Alfieri A, Fleischhammer J, Strauss C, Peschke E.SourceDepartment of Neurosurgery, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany. alex.alfieri@medizin.uni-halle.de.
Clinical anatomy (New York, N.Y.).Clin Anat.2011 Dec 20. doi: 10.1002/ca.22025. [Epub ahead of print]
The central myelin-peripheral myelin transitional zone, also referred to as the "Obersteiner-Redlich zone (ORZ)" or "glial/Schwann junction" of the nervus intermedius, is thought to play a role in the pathophysiology of nervus intermedius neuralgia (NIN). To evaluate the location and histological fe
PMID 22190233

Japanese Journal

Accuracy and Reliability of Three-Dimensional Surface Reconstruction Measurement.

水上千佳司,山本悦生,大村正樹,老木浩之,辻純,宗田由紀,田辺牧人,白馬伸洋,畦元将吾
耳鼻咽喉科臨床 86(6), 875-879, 1993
… This system offers the advantage of observation of the external aperture of the vestibular aqueduct and the porus acusticus internus in living subjects. …
NAID 130001812707

Aneurysma der arteria auditiva am porus acusticus internus

NOWAK G
Neurochirurgia 29, 241-243, 1986
NAID 30041689699

ニホンカモシカ(Capricornis crispus)の骨格に関する研究-4-頭蓋(頭蓋骨・顔面骨)について

松尾信一,森下芳臣
信州大学農学部紀要 22(2), p99-138, 1985-12
… foramen lacerum, meatus temporalis, foramen retroarticulare, porus acusticus externus, porus acusticus internus, canalis musculotubarius, foramen stylomastoideum, canalis facialis, canaliculus tympanicus. …
NAID 120001087742

「内耳孔」

Internal auditory meatus
	Left temporal bone. Inner surface.
	Diagrammatic view of the fundus of the right internal acoustic meatus.
Details
Identifiers
Latin	meatus acusticus internus
TA	A02.1.06.033
FMA	53163
	Anatomical terms of bone [edit on Wikidata]