Histological Research on the Gastric Epithelium of Zaocys dhumnades

Histological structure of gastric epithelium of Zaocys dhumnades was observed with light and electron microscope. The results showed that:①The whole surface of stomach was covered with simple columnar epithelium, the upper part of epithelial cells was filled with electron-dense, elliptical or rod-like mucous granuli which were strong positive in PAS-reaction; ②Epithelia at gastric body and pyloric area sank inward respectively, forming simple tubular fundic and pyloric glands, no cardiac gland was found; ③The tubule of fundic gland consisted of the neck part and under neck part, epithelial cells of the neck part were all full of electron-lucent, nearly round mucous granuli which were strong positive in PAS-reaction, epithelial cells of the under neck part all secreted proenzyme granuli and appeared negative in PAS-reaction; ④Epithelial cells of pyloric gland were also full of electron-lucent, nearly round mucous granluli which were strong positive in PAS-reaction; ⑤There were different types of endocrine cells distributing between or below the cells of gastric glands. Consideration of this paper: Degestive function of the stomach of Zaocys dhumnades was weak, and the evolution position of its stomaeh was lower in the Reptilia.