长鳍篮子鱼消化道黏膜上皮的扫描电镜观察

采用扫描电镜观察了长鳍篮子鱼(Siganus canaliculatus)消化道黏膜上皮表面细微的结构特征。结果显示,长鳍篮子鱼食道黏膜为纵行黏膜褶皱,在褶皱上形成"V"字型次级褶皱,黏膜上皮表面具有许多分泌孔及较多腺体导管的开口,上皮细胞扁平,似鳞片状,连接紧密。胃黏膜褶皱呈绳状纵向排列,黏膜上皮表面有许多沟回,细胞之间有较多的胃小凹,在上皮表面可见有乳头状突起,未见有微绒毛;上皮细胞为五边形或六边形,无细胞间隙。肠黏膜分布着密集排列的肠绒毛,绒毛呈拇指状或扁平状,黏膜上皮表面呈脑回状,分布有许多分泌颗粒,细胞游离面分布着丰富的微绒毛,细胞为多边形、圆形、不规则形,有细胞间隙。幽门盲囊黏膜上皮的结构与肠道相似。本文探讨了黏膜上皮结构与功能的关系。

Scanning Electron Microscope Observation on the Mucosal Epithelium of the Digestive Tract in Siganus canaliculatus

The ultrastructure of mucosal epithelium of the digestive tract in Siganus canaliculatus was examined by scanning electron microscopy. In esophagus,longitudinal folds and V-shape secondary folds of mucosal surface were observed. There were numerous secretory holes and openings of glandular duct. The squamous epithelium cells were flattened,and they were firmly bound to one another. The stomach mucosal folds were arranged vertically,showing rope-like pattern. There were many papillae and no microvillus on the surface of stomach epithelium. The epithelium cells took the shape of pentagon or hexagon,and there were more gastric pits between them. Numerous villi arranged on the surface of intestinal epithelium,showing finger-like or flattened shape. The mucosal epithelium of intestine exhibited gyrus structure,and numerous secretory granules were on the surface. The epithelium cells of intestine were polygon,round or anomalous and had intercellular space. The epithelium structure of the pyloric caeca was similar to that in intestine. In the paper,the relationship between structure of epithelium and their functions was also discussed.