Localisation et cytologie des cellules neurosécrétrices protocérébrales chez Lithobius forficatus L. (Myriapode Chilopode)

In L. forficatus (Chilopoda), various types of protocerebral neurosecretory cells and pathways of secretory products were studied.Light microscopy data include the transverse distribution, the localization of two cell types (types 1 and 2) and their arborizations. The ultrastructural study permits characterization of three cell types (A, B and C), which differ mainly in the size, number and electron opacity of their granules; variations are related to the secretory cycle.Results obtained with light and electron microscopes are compared.