| Morphological of gastrointestinal during postembryonic development and the adult of Lacerta vivipara were compared by the method of HE.The results showed the differentiation of the stomach and intestine appeared at the first day of post-embryonic development period.During this time,the stomach wall was consist of adventitia, epithelium and submucosa.The third day of post-embryonic development,the muscularis can be observed,the muscularis mucosa appeared in the first seven days after post-embryonic.The intestine wall at the first day of post-embryonic development was only consist of adventitia and epithelium.The seventh day after post-embryonic, submucosa can be observed and muscularis also can be observed at the15th day but not developed.At the40th day,the epithelium and the unconspicuous lamina propria appeared.At the40th day of post-embryonic,rectum and small intestine have an obviously difference in morphological.At the40th day of post-embryonic,the rectum wall was consist of adventitia, epithelium and underdeveloped mucosa,which was consummated gradually.Results of this study indicated the wall of gastrointestinal tract of Lacerta vivipara was formed at the sequence of adventitia, epithelium, lamina propria,submucosa,muscularis and muscularis mucosa.Adult Lacerta vivipara gastroin-testinal tract were all constituted by a completely structure of adventitia, mucosa, mus-cularis and submucosa.Grimelius method was used in this article to study the postembryonic development of Lacerta vivipara argentaffin cell in gastrointestinal tract. Result showed argentaffin cell spread in the stomach and intestines after the fist day ofpost-embryonic development and present to be diversified cell shapes which arethe shape of roud,oval,cone and fusiform shaped.These cells mainly spread between mucous epithelium cells and between acinar epithelial cells. The density curve of argentaffin cell distribution was wavy.Thereinto the density of argentaffin cell in stomach reached to the peak in the120th day of the postembryonic development period.The peak of small intestine appeared at the5th month and rectum peak appeared in the adults.This article also did a research by the method of ABC immunohistochemistry on the gastrointestinal tract endocrine cell postembryonic development of Lacerta vivipara.Results showed that5-HT cell can be earliest seen in the stomach and small intestine of a one day postembryonic Lacerta vivipara.The cells’ shape were varied and widely which were the shape of round,oval, cone and tadpole-shape.The density development tend of5-HT cell during the whole developmental stage was the same as the argentaffin cell which was wavy.Gas cell had a different distribution from the5-HT cell in gastrointestinal tract of Lacerta vivipara during the postembryonic development.Gas cell had a distribution in the stomach only at the early15days of Lacerta vivipara postembryonic development in which showed a highest density at he10th day.And after the15th day till the adult Gas cell was not found.Gas cell was detected in the small intestine after the first day of postembryonic development stage,after which the curve became wavy.And the distribution density reached the highest in the first day and the40th day.However Gas cell never did appeared in the rectum of Lacerta vivipara.This study revealed the regularity of the Lacerta vivipara gastrointestinal tract postembryonic development in the level of histology.Provide the basis material for the development of reptiles digestive system.And also revealed the appearance regularity of the Lacerta vivipara gastrointestinal tract endocrine cell,which provided a reliable gist to the study of reptiles digestive system endocrine cell. |
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