HISTOFLUORESCENT AND ULTRASTRUCTURAL STUDIES ON THE NERVOUS-SYSTEM OFDIPLOSTOMUM-PSEUDOSPATHACEUM NIEWIADOMSKA, 1984 CERCARIAE (DIGENEA)

The aminergic nervous system in cercariae of D. pseudospathaceum was s tudied by fluorescence histochemistry. Green fluorescence, showing the presence of catecholamines, was present in ganglia, ventral and dorsa l (the short part only) nerve trunks and also in the tail stem and fur cae. The ultrastructure of various parts of the nervous system (brain, nerve trunks of body and tail stem) was also studied. Two different t ypes of profiles were found in brain neuronal processes; six different types of vesicles were identified in nerve cells, as well as the sing le and shared synaptic junctions. The possible function of these struc tures is discussed.