Question

membrane - covered opening that separates the middle ear from the inner ear oval banister oval valance oval door oval window oval gable

Explanation:

The oval window is a membrane - covered opening that separates the middle ear from the inner ear. It is an important structure in the auditory system. The stapes (one of the ossicles in the middle ear) attaches to the oval window. When sound vibrations cause the ossicles to move, the stapes transmits these vibrations to the fluid - filled cochlea (part of the inner ear) through the oval window.

Answer:

oval window