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Anatomy and Histology of Gastrointestinal Tract during Postembryonic Development of the Chinese Giant Salamander Andrias davidianus

LI Ning① LIANG Gang① LIU Ting-Ting② ① College of Life Sciences,Shaanxi Normal University,Xi′an 710062;② Shaanxi Fisheries Institute,Xi′an 710082,China  
Morphological changes of gastrointestinal tract during postembryonic development of the Chinese giant salamander Andrias davidianus were observed.The gastrointestinal tract was a straight tubular structure on the 7th day after hatching(DAH),and the differentiation between the stomach and the intestine was observed on the 21st DAH.On the 35th DAH,the stomach,small intestine and large intestine were observed.The structure of gastrointestinal tract was simple,only with mucous epithelium on the 7th DAH.On the 21st DAH,the stomach was composed of mucous epithelium,lamina propria,muscularis and adventitia,and the intestine consisted of mucous epithelium and muscularis.Adventitia of small intestine and large intestine were formed on the 77th and 98th DAH respectively,and lamina propria appeared on the 98th and 119th DAH respectively.On the 180th DAH,the gastrointestinal tract wall had mucous epithelium,lamina propria,submucosa,muscularis and adventitia.
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