银鲫消化道的组织形态学和组织化学

A Study of the Histology and Histochemistry of the Alimentary Canal of Carassius auratus gibelio

本文对银鲫消化道结构进行了组织学和组织化学的观察。研究结果表明，该杂食性硬骨鱼的咽后消化道是由食道、小胸前部（即小肠球茎部）、小肠后部（即小肠中、后段和直肠）组成。消化道组织分层为粘膜层、粘膜下层、肌层及外膜。食道前侧区粘膜上皮主要由鳞状上皮细胞组成，上皮表层分布有微嵴和味蕾。食道后侧区粘膜上皮由柱状细胞和粘液细胞组成。从小肠球茎部到小肠后部以至直肠，粘膜皱襞逐渐由高变低，杯状细胞由少变多。小肠上皮主要由技状细胞和林状细胞组成。粘液细胞和林状细胞呈PAS反应，中性粘多糖和唾液酸蛋白含量丰富。从整个场道粘膜上皮细胞来看，碱性磷酸酶及腺着三磷酸酶活性则从前至后有逐渐降低的趋势。

The histology and histochemistry of the alimentary canal of Carassius auratus gibelio were described in detail in this paper. The gut of this fish,an omnovorous teleost,consisted of the esophagus, anterior intestine and posterior intestine (include rectum). Stratif ied epithelium with taste buds,Iongitudinal ridges and many goblet cells were present in the esophagus, varied from stratified anteriorly to simple columnar posteriorly. Columnar absorping cells and goblet cells were present in the epithelium of the intestine. The distribution of goblet cell -nucin was given,differentiating it into neutral and sialomucins. This morphological evidence was similar to that demonstrated in stomachless teleosts. Alkaline phosphtive and ATPase activity in alimentary canal was investigated.