Fine structure of the digestive tract epithelium in the terrestrial isopod. Armadillidium vulgare
Fine structure of the digestive tract epithelium in the terrestrial isopod. Armadillidium vulgare
复制标题
陆生等足动物消化道上皮的精细结构。
作者：
G. Vernon;L. Herold;E. R. Witkus
本文对陆生等足类鼠妇Armadillidium vulgre的后肠、肝胰腺叶和肝胰腺管的超微结构进行了研究。肝胰腺的单层上皮由S和B两种细胞组成。两种细胞都有大量的微绒毛。肝胰管和后肠是由一种细胞组成的单层上皮。导管内微绒毛不明显。导管和后肠的细胞被角质层覆盖。致密颗粒体是导管细胞胞质的特征。后肠上皮细胞具有明显的顶侧和基底侧细胞质内折。从大的表皮下空间，特别是在后肠的顶端内折。微管和大量的线粒体与细胞质内折叠有关。大的微管束可见于外周细胞质中，残留体存在于中央细胞质中。侧质膜形成分隔桥粒在顶端区域的细胞，而小带粘附和细胞间隙被发现的基底分隔桥粒。后肠的细胞组织暗示了在水和离子运输中活跃的细胞。
An ultrastructural study of the hindgut, associated hepatopancreatic lobes and hepatopancreatic ducts of the terrestrial isopod, Armadillidium vulgre was undertaken. The simple epithelium which lines the heptopancreas consists of two cell types, S and B. Both cell types have numerous microvilli. A simple epithelium consisting of one cell type lines the hepatopancreatic ducts and the hindgut. Microvilli are not evident in the duct. The cells of the duct and the hindgut are covered with a cuticle. Dense granular bodies are characteristic of the cytoplasm of the duct cells. The hindgut epithelial cells have pronounced apical and basal‐lateral cytoplasmic infoldings. Apical infoldings from large subcuticular spaces, especially in the posterior hindgut. Microtubules and large numbers of mitochondria are associated with the cytoplasmic infoldings. Large microtubular bundles are seen in the peripheral cytoplasm, and residual bodies are present in the central cytoplasm. Lateral plasma membranes form septate desmosomes in the apical region of cells, while zonulae adherentes and intercellular spaces are found basal to the septate desmosomes. The cellular organization of the hindgut is suggestive of cells active in water and ion transport.