The results of observation on the salivary gland and salivary secretory duct of Korean slug, Incilaria fruhstorferi, in histochemical method are as follows. It is observed that there are six kinds of gland cells(Type-A, B, C, E and F) making up the salivary gland of Korean slug. Of those, type-A gland cell is observed as an acid mucous cell, and type-B, C, D, F gland cells as neutral mucous cells. But in type-E gland cell, while the membrane surrounding granules exhibit alcianophilia, granules show no reaction. The salivary secretory duct composing the salivary gland of Korean slug is composed of supporting epithelial cell and four kinds of gland cells(type-A, E, F and G), of which type-A, E, F gland cells compose both the acinus of salivary gland and endothelial tissue of salivary secretory duct, and are secreted into lumen through salivary secretory duct. But, type-G gland cell is observed only in the endothelium of salivary secretory duct and mucous granules are observed as neutral mucopolysaccharide.
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