・「Both the oval and round windows are about the same size, approximately 2.5 mm2.」(Wikipedia)
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骨・膜迷路 |
骨迷路 |
骨・膜迷路 |
左鼓室(前面) |
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蝸牛ラセン管(模型図) |
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以下は「Wikipedia」の解説文となる。
The oval window (or fenestra vestibuli or fenestra ovalis) is a 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 amplified over 10 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. 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.
【 語 句 】
・membrane:膜 ・middle ear:中耳 ・cochlea:蝸牛 ・inner ear:内耳 ・tympaic membrane:鼓膜 ・ossicles:耳小骨 ・intersection:交点 ・stapes:アブミ骨 ・amplify:増幅する ・testament:証し ・reniform:腎臓形の ・tympanic cavity:鼓室 ・vestibule:前庭 ・convex:凸状の ・circumference:周囲 ・annular ligament:輪状靭帯 ・foramen:孔
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