The scala vestibuli is one of the three fluid-filled chambers in the cochlea of the inner ear. It is located above the scala media and is filled with a fluid called perilymph. This chamber plays a crucial role in the process of hearing by transmitting sound vibrations from the oval window, which is the membrane-covered opening that leads into the cochlea. Sound waves enter the cochlea through the oval window, causing the perilymph in the scala vestibuli to move. This movement creates pressure waves that travel through the cochlea, ultimately stimulating the hair cells in the scala media. These hair cells convert the mechanical vibrations into electrical signals, which are then sent to the brain for interpretation as sound.