|View of the inner wall of the tympanum. (label is 'fen. oval.' - black circle near top.)|
|Right osseous labyrinth. Lateral view. (label is 'vestibular fenestra' - black circle near center.)|
|Latin||fenestra vestibuli, fenestra ovalis|
|Gray's||subject #230 1040|
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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