The stereocilia contact an overlying accessory structure: the tectorial membrane C Spiral organ Hair cells Tectorial membrane of Corti nner Oute ∥∥的 Stereocilia Rods and tunnel of corti 965 Basilar membrane Supporting Spiral lamina Afferent nerve fibers Efferent nerve fibers Spiral ganglion As basilar membrane moves up, hairs are deflected outward causing depolarization of hair cells and increased firing of afferent nerve fibersThe stereocilia contact an overlying accessory structure: the tectorial membrane