The intracellular potentials of the cells in the stria vascularis were precisely recorded using cell marking technique. The intracellar potentials of marginal cell, intermediate cell and border cell are +79.8±5.2mV, +32.1±9.7mV and+9.7±5.8mV respectively. The spacial distributions of dc potential and potassium ion in the stria vascularis were also surveyed with double barrel potassium sensitive electrode. A large and a relatively small electrochemical gradients were found on the intermediate cell-side and the endolymphside of cell membranes of marginal cell respectively, which imply the locations of potassium pumps in the stria vascularis.
