[Comparison of two different recording sites in electrocochleography: promontory and external mastoid position...

One possible evaluation of the functional unit: hair-cell/afferent neurit is the recording of an action-potential (AP) from the acoustic nerve. The authors report their experience in recording the AP from an external position on the mastoid planum and from a transtympanic position on the promontory. The promontory site is prefered because of the higher electrical response amplitude and because of its relatively reduced sensitivity against myogenic potentials. Characteristic findings in normal ears and in some pathological conditions are to be demonstrated.