What happens when the oval-window membrane is forced inward toward the fluid in the inner ear?

When the oval window membrane is forced inward, it creates pressure waves in the fluid of the inner ear, specifically in the cochlea. This movement of fluid stimulates the sensory hair cells in the cochlea, leading to the conversion of mechanical energy into electrical signals. These signals are then transmitted to the brain via the auditory nerve, allowing us to perceive sound. This process is essential for the functioning of our hearing system.