Electron Microscopical Observation of the PAS-Positive Cells in the Supraoesophageal Ganglion of the Prawn, Penaeus japonicus B_ATE

Abstract

As reported previously, peculiar cells were detected in the supraoesophageal ganglion of the prawn. These cells contained a granular substance, resernbling a grain of rice in shape. Histochemical exmination under light microscope revealed that the substance was PAS-positive. The present study by electron microscopy deals with the ultrastructure and the re-identification of the cytochemical character of this substance. The results obtained from this study are as follows. 1) The granular substance possesses no limiting membrane and seems to have a polysaccharide character, because of positive reaction to silver proteinate. 2) Internally and peripherally, there exist many cored or granular vesicles, which are suggested to be functionally associated with Golgiapparatus.