Final answer:
The scala tympani and scala vestibuli are the cochlear chambers that contain perilymph, which transmits sound vibrations to stimulate the hair cells in the organ of Corti.
Step-by-step explanation:
The cochlea of the inner ear is divided into three chambers: the scala tympani, the scala media, and the scala vestibuli. Among these, the scala tympani and the scala vestibuli contain a fluid called perilymph, which is important for transmitting sound vibrations within the cochlea. The scala media, on the other hand, is filled with endolymph and contains the organ of Corti, which converts sound vibrations into nerve signals that the brain interprets as sound. The movement of perilymph in the scala vestibuli, and subsequently through the scala tympani, causes the basilar membrane to move. This movement stimulates the hair cells within the organ of Corti to send auditory signals to the brain.