Correlative morphometric and electrochemical measurements of serotonin content in earthworm muscles

Significant correlation was found between the innervation density and the ip values recorded in different areas. The ip values recorded at different times in different locations are determined by instantaneous serotonin concentration of the living tissue. As far as we know this is the first report using in vivo voltammetry investigating serotonin content in earthworm, E. fetida.