The cochlear potentials (EP, CM and AP) were monitored during an experimental labyrinthectomy in the guinea pig. The potentials were recorded with a glass microelectrode inserted in the scala media of the first or second cochlear turns.
The potentials suffered little change during and after drilling of the lateral semicircular canal. Although subsequent drilling of the vestibular labyrinth caused decline of potentials, the EP was quite stable before the vestibule was opened. The recovery of EP was observed in one ear of the three whose vestibule were packed with gelatin sponge.
