Oval Window

The oval window (or vestibular window) is a membrane-covered opening which leads from the middle ear to the vestibule of the inner ear.

Vibrations that come into contact with 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 twenty times 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. In the recent state 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.

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Cochlea - Physiological Functioning - Detailed Events
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... The secondary tympanic membrane (or round window membrane) covers the round window, sealing off one of two openings into the inner ear ... entering the cochlea through the oval window as the fluid in the cochlea is displaced when pressed by the stapes at the oval window ... Eardrum (Umbo Pars flaccida) Middle ear Tympanic cavity Labyrinthine wall/medial Oval window Round window Secondary tympanic membrane Prominence of facial canal Promontory of ...

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