皱纹盘鲍嗉囊和胃的超微结构与功能

Ultrastructure and function of the crop and the stomach of Hallotis discus hannai

以扫描电镜和透射电镜观察、组织化学及酶活性测定等方法研究了皱纹盘鲍的嗉囊和胃。嗉囊及胃平展处上皮细胞呈现吸收细胞的超微结构特征 :微绒毛、质膜内陷和胞饮泡、次级溶酶体以及贮存物质(脂类和糖原 )。胃褶皱处上皮细胞具纤毛 ,起分选和运输食物的作用。胃上皮细胞基部有神经分布。组织化学研究表明嗉囊和胃上皮细胞呈现蛋白酶和非特异性酯酶活性。体外酶活性分析表明嗉囊和胃上皮细胞分别具有三种和四种植物多糖酶活性。

The ultrastructure and function of crop and stomach of Haliotis discus hannai Ino were studied with histochemical method, electron microscopic observation and test for some enzymatic activity in vitro. The epithelial cells of the crop and the flat part of the stomach show the ultrastructural features of absorptive cells : microvilli,signs of endocytosis, occurrence of secondary lysosomes and storage of reserve materials (glycogen and lipid). These features indicate that absorption of energy rich substances can occur in the crop and the stomach. The fold part of the stomach is lined by ciliated cells which are involved in sorting and transport of food particles. The intraepithial neurons were observed in the stomach. The epithelial cells of the crop and the stomach show proteinase and non specific esterase activity by histochemical tests, and show activity of three or four polysaccharide enzymes by test in vitro.