Round window
（重定向自Fenestra cochleae）
![](/Images/godic/202501/12/Blausen_0330_EarAnatomy_MiddleEar5011.png")
![](/Images/godic/202501/12/Gray9215011.png")
The round window is one of the two openings from the middle ear into the inner ear. It is sealed by the round window membrane, which vibrates with opposite phase to vibrations entering the inner ear through the oval window. It allows fluid in the cochlea to move, which in turn ensures that hair cells of the basilar membrane will be stimulated and that audition will occur.