乌梢蛇胃上皮的组织学研究

Histological Research on the Gastric Epithelium of Zaocys dhumnades

用光镜和电镜观察了乌梢蛇胃上皮的组织结构 ,结果表明 ,①胃表面上皮均为单层柱状上皮 ,上皮细胞上部充满电子密度较高的椭圆形或杆状黏液颗粒 ,PAS反应呈强阳性 ;②胃体及幽门区上皮分别内陷形成单管状的胃底腺和幽门腺 ,无贲门腺 ;③胃底腺腺管分颈部和颈下部 ,颈部上皮细胞充满电子密度较低的近圆形的黏液颗粒 ,PAS反应呈强阳性 ,颈下部上皮细胞均分泌酶原颗粒 ,PAS反应呈阴性 ;④幽门腺细胞中亦充满电子密度较低、近圆形的黏液颗粒 ,PAS反应呈强阳性 ;⑤胃腺上皮细胞之间和腺细胞基部有不同类型的内分泌细胞分布。本文认为 ,乌梢蛇胃的消化能力较弱 ,其胃的进化在爬行动物中处于较低等的地位。

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.