| Round window | |
|---|---|
 Middle ear, with round window at right. | |
 Interior of right osseous labyrinth (label is cochlear fenestra, at bottom center) | |
| Details | |
| Identifiers | |
| Latin | fenestra cochleae, fenestra rotunda |
| MeSH | D012405 |
| TA98 | A15.3.02.015 |
| TA2 | 6904 |
| FMA | 56932 |
| Anatomical terminology | |
The round window is one of the two openings from the middle ear into the inner ear. It is sealed by the secondary tympanic membrane (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.