西施舌消化系统形态学、组织学与组织化学的研究

采用解剖学、组织学和组织化学方法对西施舌Mactra antiquata消化系统的结构和功能进行了研究。结果表明:西施舌的消化系统由消化道和消化盲囊组成。消化道包括唇瓣、口、食道、胃、晶杆囊、肠、直肠和肛门,除唇瓣、晶杆囊外,消化管壁由内向外可分为黏膜层、黏膜下层、肌层和外膜;胃壁和肠壁的局部缺乏肌层;消化盲囊为复管泡状腺,以导管与胃腔相通;腺上皮由胚性细胞(E-细胞)、纤维细胞(F-细胞)、吸收细胞(R-细胞)和分泌细胞(B-细胞)组成;在口、胃、肠等部位的消化管腔及盲囊腺腔中存在着吞噬细胞;肠上皮有较强的碱性磷酸酶活性,胃上皮、肠上皮和消化盲囊导管上皮有较强的酸性磷酸酶活性,胃壁、肠壁和消化盲囊中含有铁。

Morphological, histological and histochemical observation of digestive system in Mactra antiquata

The structure and function of the digestive system in Mactra antiquata were studied by anatomical,histological and histochemical methods.The digestive system consists of the digestive tract,which is composed of the labial palps,mouth,esophagus,stomach,style sac,intestine,rectum and anus,and digestive diverticula.Except the labial palps and style sac,the tract consists of mucous membrane,submucosa lamina,lamina muscularis and adventitia.There is no muscular layer in a part of the stomach and the intestine.The adventitia is composed of fibrosa,except serosa covering the wall of mouth,rectum and anus.The digestive diverticulae are compound tubuloacinar glands which connected to the stomach by a system of ducts.The glandular epithelium is comprised of four types of cells: embryo cell(E-cell),fibrillar cell(F-cell),absorptive cell(R-cell) and secretory cell(B-cell).The lumen of mouth,stomach and intestine and glandular cavity are filled with phagocytes.Intense alkaline phosphatase activity was detected in the epithelium of the intestine.The epithelia of stomach and intestine and ducts show strong activity of acid phosphatase.There are irons in the submucosa lamina of stomach and intestine and digestive diverticula.