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'''Internal Auditory Meatus'''

[[File:Gray141.png|thumb|right|250px|Base of the skull. Internal auditory meatus is labeled at right (click image to view detail)]]

The '''Internal Auditory Meatus''' (IAM) is a canal within the [[temporal bone]] of the skull. It is a significant structure in the [[human anatomy]] as it allows passage for two crucial cranial nerves, the [[facial nerve]] (VII) and the [[vestibulocochlear nerve]] (VIII).

==Anatomy==

The IAM is located in the posterior part of the temporal bone, opening into the posterior cranial fossa. It is approximately 1 cm in length and runs from the inner ear to the cranial cavity. The canal is divided into two sections: the facial nerve canal and the cochlear nerve canal.

===Facial Nerve Canal===

The [[facial nerve]] (VII) travels through the facial nerve canal. This nerve is responsible for controlling the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue and oral cavity.

===Cochlear Nerve Canal===

The [[vestibulocochlear nerve]] (VIII) travels through the cochlear nerve canal. This nerve is divided into two parts: the cochlear nerve, which transmits sound information, and the vestibular nerve, which carries balance information.

==Clinical Significance==

The IAM is clinically significant as it can be affected by various conditions such as [[vestibular schwannoma]], [[meningioma]], and [[facial nerve palsy]]. These conditions can cause symptoms such as hearing loss, tinnitus, and vertigo.

==See Also==

* [[Cranial nerves]]
* [[Temporal bone]]
* [[Vestibular schwannoma]]

==References==

<references />

[[Category:Human anatomy]]
[[Category:Skull]]
[[Category:Cranial nerves]]
[[Category:Auditory system]]

Internal auditory meatus - Revision history

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