vestibular aqueduct
{{Short description|Channel through the temporal bone of the skull}}
{{Infobox anatomy
| Name = Vestibular aqueduct
| Latin = aquaeductus vestibuli
| Image = Right_osseous_labyrinth_interior_svg_hariadhi.svg
| Caption = Interior of right osseous labyrinth.
| Image2 = Gray923.png
| Caption2 = The cochlea and vestibule, viewed from above. (Aquaeductus vestibuli labeled at bottom right.)
| System =
| Precursor =
}}
At the posterior lateral wall of the temporal bone is the vestibular aqueduct, which extends to the posterior surface of the petrous portion of the temporal bone.{{cite web|title=Enlarged Vestibular Aqueduct Syndrome|url=http://vestibular.org/enlarged-vestibular-aqueduct-syndrome-evas}} The vestibular aqueduct parallels the petrous apex, in contrast to the cochlear aqueduct, which lies perpendicular to the petrous apex.
It transmits a small vein, and contains a tubular prolongation of the membranous labyrinth, the ductus endolymphaticus, which ends in a cul-de-sac, the endolymphatic sac, between the layers of the dura mater within the cranial cavity.
Pathology
Enlargement of the vestibular aqueduct to greater than 2 mm is associated with enlarged vestibular aqueduct syndrome, a disease entity that is associated with one-sided hearing loss in children. The diagnosis can be made by high resolution CT or MRI, with comparison to the adjacent posterior semicircular canal. If the vestibular aqueduct is larger in size, and the clinical presentation is consistent, the diagnosis can be made. Treatment is with mechanical hearing implants. There is an association with Pendred syndrome and incomplete cochlear partition (so called "Mondini dysplasia").{{cite journal|pmid=19775757|year=2009|last1=Atkin|first1=J. S.|title=Cochlear abnormalities associated with enlarged vestibular aqueduct anomaly|journal=International Journal of Pediatric Otorhinolaryngology|volume=73|issue=12|pages=1682–5|last2=Grimmer|first2=J. F.|last3=Hedlund|first3=G|last4=Park|first4=A. H.|doi=10.1016/j.ijporl.2009.08.028}}
Additional images
File:Gray193.png|Base of the skull. Upper surface.
File:Temporal bone1.jpg|Temporal bone
References
{{Gray's}}
{{Reflist}}
{{Auditory and vestibular anatomy}}
{{Portal bar|Anatomy}}
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