The fenestra cochleæ (fenestra rotunda, or round window) is a membrane that is situated below and a little behind the fenestra vestibuli, from which it is separated by a rounded elevation, the promontory.
The fenestra cochleæ (fenestra rotunda, or round window) is one of two membranes that separates the inner ear from the middle ear. The round window is a membrane that is situated below and a little behind the fenestra vestibuli, from which it is separated by a rounded elevation, the promontory.