尾斑瘰螈主要消化器官组织结构观察

本研究采用组织学方法对尾斑瘰螈(Paramesotriton caudopunctatus)的消化器官进行了显微结构观察。结果表明,尾斑瘰螈食管较短,胃、肠壁组织结构分为黏膜层、黏膜下层、肌层和外膜,小肠前段的黏膜下层缺失。胃黏膜层中有许多胃腺,胃腺细胞胞质含嗜酸性颗粒。小肠前段绒毛细长密集,中段、后段逐渐短小稀疏,在黏膜层的固有膜中没有肠腺分布。肝实质中肝小叶界限不明显,肝小叶内有大量色素颗粒成团分布。

Histological Structure of Main Digestive Organs in Paramesotriton caudopunctatus

In this study, we observed the microstructure of digestive organs of Paramesotriton caudopunctatus by using histological methods. The results show that the esophagus of P.caudopunctatus is short; the tissue structure of stomach and intestine is divided into the mucosa, submucosa, muscularis and adventitia; submucosa is lost in the preceding section of small intestine. Gastric mucosal layer contains many gastric adenocarcinoma, and gastric adenocarcinoma cell cytoplasm contains eosinophilic granules. The slender villi in the preceding segment of the small intestine are intensive; the slender villi in the middle and posterior segments of the small intestine gradually become short and sparse; the midgut gland in the lamina propria of mucous layer is absent. The boundaryies of parenchymal liver lobule is not obvious, and numerous pigment particles distribute within the hepatic lobule.