Anatomical and Histological Observation of Digestive Tract in the Ichthyophis bannanicus
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    Abstract:

    The anatomical and histological characters of the digestive track of Ichthyophis bannanicus,an endangered Amphibia species in mainland China,have been observed in detail. The digestive tract of I.bannanicus is a straight tubular but not a coiling structure. The differentiation is clear between the stomach and the intestine,and the latter is divided into duodenum,jejunum,large intestine and rectum. The epithelium is stratified columnar rather than stratified columnar ciliated in oesophagus,simple columnar in stomach,and stratified squamous in rectum. Numerous large goblet cells and some simple acinar intermaxillary glands lay in the mouth epithelium. The oesophagus in the lower segment contains agglomerate and acinous oesophageal glands. The stomach corpora contains masses of simple tubular gland. The duodenum and jejunum have simple acinous intestinal glands,and the villi are developed. The submucosa of the oesophagus and rectum is loose connective tissue,the oral-pharyngeal cavity is not obvious,and the rests are close connective tissue. Besides the muscular layer of oral-pharyngeal cavity is skeletal muscle,while the rests are inner circular muscle layer and the outer longitudinal muscle layer. The two muscular layers of duodenum and jejunum are connected by close connective tissue.

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LI Jia-Zhou, LI Gui-Fen, HE Hua-Li, MENG Shao-Quan, BEI Yong-Jian, XIE Wen-Hai. 2009. Anatomical and Histological Observation of Digestive Tract in the Ichthyophis bannanicus. Chinese Journal of Zoology, 44(6): 96-102.

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History
  • Received:May 14,2009
  • Revised:August 31,2009
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