You have external ear, middle ear and the internal ear. You have the auricle and the ear canal is there in the external ear. Then you have a ear drum, that separates external ear from the middle ear. In the middle ear, you have three tiny bones. Eustachian canal is there in the middle ear. Then you have oval and round window to separate the middle ear from internal ear. In the internal ear, you have vestibulocochlear apparatus and the vestbulocochlear nerve is there.

The oval window is part of the middle ear but in theory, yes it does separate the middle ear from the inner ear.

The tympanic membrane (eardrum) separates the external ear from the middle ear

The middle ear, outer ear, and inner ear are the three parts of the ear.

The middle ear cleft is the space within the middle ear that includes the eardrum, the middle ear cavity, and the three small bones known as the ossicles. It is responsible for transmitting sound vibrations from the outer ear to the inner ear. The middle ear cleft is important for normal hearing and is often affected by conditions such as ear infections or tumors.