缢蛏消化道组织学与组织化学的研究

运用组织学和组织化学染色方法对缢蛏消化道的组织结构和功能进行了研究。结果表明 ,缢蛏的消化道由唇瓣、口、食道、胃、晶杆囊、肠、直肠和肛门组成。除唇瓣外的消化管壁由内向外可分为 4层 :粘膜层、粘膜下层、肌层和外膜。粘膜层包括粘膜上皮和粘膜肌层。口腔上皮为假复层纤毛柱状上皮 ,其它部位的粘膜上皮都为单层纤毛柱状上皮。胃壁的局部和肠壁缺乏肌层。除口的腹面、直肠、肛门等处的外膜为浆膜外 ,其余皆为纤维膜。肠上皮、直肠上皮和唇瓣上皮有较强的碱性磷酸酶活性 ,胃上皮和肠上皮有较强的酸性磷酸酶活性。直肠的粘膜及粘膜下层中含有丰富的钙和铁

Histological and Histochemical Study on the Digestive Tract of Sinonovacula constricta

The structure and function of the digestive tract of Sinonovacula constricta was studied by histological and histochemical methods. The digestive tract is composed of the labial palps, mouth, esophagus, stomach, style sac, intestine,rectum and anus. The tract except the labial palps consists of mucous membrane, submucosa lamina, lamina muscularis and adventitia. The mucous membrane is made up of epithelial lining and lamina muscularies mucosae. The type of epithelial lining is simple ciliated columnar epithelium, but the mouth is pseudostratified ciliated columnar epithelium. A part of the stomach and the intestine has no muscular layer. The adventitia is composed of fibrosa, except serosa covering the walls of ventical mouth, rectum and anus. Intense alkaline phosphatase activity was detected in the epitheliums of intestine, rectum and labial palps. The epitheliums of stomach and intestine show strong activity of acid phosphatase. Abundant Fe and Ca exist in the mucous membrane and submucosa lamina of rectum.