What creates the boundary between the air-filled middle ear and the fluid-filled inner ear?

Question

Quizplus · Accepted Answer

The boundary between the air-filled middle ear and the fluid-filled inner ear is created by the oval window, a membrane-covered opening that separates the middle and inner ear. The tympanic membrane, tectorial membrane, and basilar membrane are all located within the inner ear and do not create the boundary between the middle and inner ear.

What Creates the Boundary Between the Air-Filled Middle Ear and the Fluid-Filled