If you were explaining what occurs in the structures of the cochlea, you would most likely say all of the following except aIn the cochlear duct , fluid pressure waves move the organ of Corti's hair cells against the tectorial membrane , bending the stereocilia and generating nerve impulses in the cochlear nerves. b. In the scala tympani , fluid pressure waves move the organ of Corti's hair cells against the basilar membrane , bending the stereocilia and generating nerve impulses in the cochlear nerves . . Fluid pressure waves from the scala vestibuli reach the cochlear duct , forming fluid pressure waves in its endolymph . d. Sound vibrations push the oval window against the scala vestibuli , building up fluid pressure waves in its perilymph .