黄喉拟水龟消化道的组织学观察

观察黄喉拟水龟消化道的组织结构.采用常规石蜡切片和HE染色方法对黄喉拟水龟的消化道进行观察.除了口咽腔以外,消化道的管壁是由粘膜层、粘膜下层、肌肉层和外膜组成;各部分的主要区别在于粘膜层,食道和大肠的是复层柱状上皮,胃和小肠的是单层柱状上皮.黄喉拟水龟的舌桔红色,不能伸缩;食管中无食管腺,扩张性强;胃呈囊状,有大量胃腺,腔面皱襞较多;小肠较长,是消化的主要场所,表面有大量的绒毛,在绒毛中可见肠腺;大肠无绒毛,也存在皱襞.

Histological observation of the digestive system of Mauremys mutica

The histological characters of oral-pharyngeal cavity,esophagus,stomach,small intestine and large intestine of Mauremys mutica were studied by paraffin section and microphotograph techniques.The results showed that except for oral-pharyngeal cavity,the digestive tract includes four layers,namely mucous layer,tunica submucosa,muscular coat and tunica externa.The difference of each part of digestive tract mainly exists in mucous layer.The epithelia of stomach and small intestine are simple columnar cells.The epithelia of esophagus and large intestine are stratified columnar epithelia.The tongue is salmon pink and it is fixed.The esophagus is distensible. There are many gastric glands in the saclike stomach and many plicae on the inner wall of stomach.The small intestine is the main part of digestive tract.The inner wall of intestine has a lot of villi,while the large intestine has folds but no villi.