ZEBRIN-II DISTINGUISHES THE AMPULLARY ORGAN RECEPTIVE MAP FROM THE TUBEROUS ORGAN RECEPTIVE MAPS DURING DEVELOPMENT IN THE TELEOST ELECTROSENSORY LATERAL LINE LOBE

In weakly electric gymnotiform teleosts, monoclonal antibody anti-zebrin II recognizes developing pyramidal cells in the ampullary organ-receptive medial segment of the medullary electrosensory lateral line lobe (ELL) and in the mechanoreceptive nucleus medialis. Developing pyramidal cells in the remaining three tuberous organ-receptive lateral ELL segments are unreactive. These results suggest that certain biochemical features of the ELL ampullary organ-receptive medial segment are more similar to, the nucleus medialis than to the tuberous organ-receptive ELL segments, and support the hypothesis that the ampullary system evolved from mechanosensory precursors.