Oval window
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| Oval window | |
|---|---|
| File:Blausen 0330 EarAnatomy MiddleEar.png Middle ear, with oval window at right. | |
| File:Right osseous labyrinth svg hariadhi.svg Right osseous labyrinth. Lateral view (label is vestibular fenestra — black circle near center) | |
| Details | |
| Identifiers | |
| Latin | fenestra vestibuli, fenestra ovalis |
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| TH | {{#property:P1694}} |
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| Anatomical terminology [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
The oval window (or fenestra vestibuli or fenestra ovalis) is a connective tissue membrane-covered opening from the middle ear to the cochlea of the inner ear.
Vibrations that contact the tympanic membrane travel through the three ossicles and into the inner ear. The oval window is the intersection of the middle ear with the inner ear and is directly contacted by the stapes; by the time vibrations reach the oval window, they have been reduced in amplitude and increased in pressure due to the lever action of the ossicle bones. This is not an amplification function; rather, an impedance-matching function, allowing sound to be transferred from air (outer ear) to liquid (cochlea).
It is a reniform (kidney-shaped) opening leading from the tympanic cavity into the vestibule of the inner ear; its long diameter is horizontal and its convex border is upward. It is occupied by the base of the stapes, the circumference of which is fixed by the annular ligament to the margin of the foramen.
Additional images
[edit | edit source]-
View of the inner wall of the eardrum (label is fen. oval. – black circle near top)
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Cochlea
See also
[edit | edit source]- Round window
- Public domain This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
References
[edit | edit source]External links
[edit | edit source]- Diagram at Washington University School of Medicine
- The Anatomy Wiz. Oval Window
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