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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. It is underneath the Hammer, Anvil and Stirrup bones and it is also next to the Ear Drum. To the Right is the Cochlea and the Auditory Nerve. ==Additional images== Gray911.png|View of the inner wall of the eardrum (label is ''fen. oval.'' — black circle near top) File:Cochlea.svg|Cochlea 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oval window」の詳細全文を読む スポンサード リンク
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