Oval window

Oval window
Middle ear, with oval window at right.
Right osseous labyrinth. Lateral view (label is vestibular fenestra — black circle near center)
Details
Identifiers
Latin Fenestra vestibuli,
fenestra ovalis
MeSH D010046
TA A15.3.02.009
FMA 56913
Anatomical terminology

The oval window (or fenestra vestibuli) is a membrane-covered opening that leads from the middle ear to the vestibule 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 amplified over 10 times[1] from what they were when they contacted the tympanic membrane, a testament to the amplifying power of the middle ear.

It is a reniform (kidney-shaped) opening leading from the tympanic cavity into the vestibule of the internal 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

See also

References

  1. ↑ Moore and Dalley. Clinically Oriented Anatomy. 4th edition; 1999. p 971.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.