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Histological and Histochemical Studies on the Digestive System of Apostichopus japonicus

CUI Long\|Bo\ DONG Zhi\|Ning\ LU Yao\|Hua (Department of Biochemistry,Yantai University\ Yantai\ 264005,China)  
The digestive system of Apostichopus japonicus was studied with histological and histochemical methods.The wall of the digestive tract includes mucosa,submucosa muscular layer and adventitia.The mucosa consists of pseudo\|mucous cells.The mucous cells lie in the anterior part of the foregut and cloaca.The epithelium of the foregut and the midgut shows proteinase,lipase and nonspecific stritified or simple epithelium which is made up of columnar or cuboidal cells and esterase activitis.In the midgut,the apithelial cells with dense microvilli show alkaline phosphatase activity in the apical membrine,and the blood space is plentiful beneath the epithelium,which suggests that the midgut play a great role in food absorption.
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