中华绒螯蟹消化道组织学及扫描电镜研究

对中华绒螯蟹成蟹消化道各段进行了光镜组织学结构的观察；应用扫描电镜技术，观察了中华绒螯蟹消化道各段黏膜上皮表面超微结构特征。结果表明：除中肠及后盲囊外，整个消化道黏膜上皮表面均有较厚的分泌物层和较发达的纤毛层。纤毛形态结构各异；以食道和后肠分布最密，胃和肠球次之。消化道各段黏膜上皮细胞表面均形成大小不一、形态各异的多级皱褶和嵴。仅中肠表面具典型微绒毛结构。各消化道段黏膜上皮表面均未见杯状细胞，上皮下基膜发达，黏膜下层明显，消化腺分布其间。整个消化道壁的肌层均为横纹肌，且排列疏松，外膜多为浆膜。

STUDIES ON HISTOLOGY AND SCANNING ELECTRON MICROSCOPE OF DIGESTIVE TRACT OF CHINESE MITTEN-HANDED CRAB (ERIOCHEIR SINENSIS)

Taking out digestive tract of Chinese mitten handed crab ( E. Sinensis) , esophageal anterior segment and posterior segment; cardiac fundus, cardiac side and back; midgut anterior segment and posterior segment; intestinal bulb anterior segment and posterior segment, and posterior blind sac; hindgut anterior segment, middle segment and posterior segment were divided and made specimens. By using the technique of scanning electron microscope, the ultrastructure characteristics of the surface of epithelium mucosae of every segment digestive tract of Chinese mitten handed crab ( E. Sinensis) , and at the same time histological structure were observed. The results showed that there were the more thick lamena secreta and the more developed lamena cilia in the surface of epithelium mucosa of whole digestive tract except in the midgut and posterior boind sac. The distribution density and form of cilium were difference in different places of digestive tract. The distribution density of cilia were the most in the esophagus and hindgut, and took second place in the stomach and intestinal bulb. The multipolar folds and ridges differed in size and in shape in the surface of epithelium mucosa of each segment of digestive tract. Only in midgut there was structure of the typical microvilli. No goblet cells were found in the surface of epithelium mucosa of each segment of digestive tract. The basement membrane was developed under epithelium. The submucous layer was clear, and the digestive gland distributed among it. The muscular coat of whole digestive tract wall Consisted of striated muscle but its arrangement was loose. The most membrana externa was the membrana serosa.