Histological and Ultrastructural Studies on the Intestine of Guntea Loach, Lepidocephalichthys Guntea (Cypriniformes, Cobitidae)

S. Ghosh
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引用次数: 1

Abstract

Abstract The cellular organizations of intestine in Lepidocephalichthys guntea (Hamilton, 1822) have been described by light as well as scanning and transmission electron microscopy. The intestine is short and straight like, marked into anterior, middle and posterior region based on mucosal folds, number and size of columnar epithelial cells and mucous cells, thickness of submucosa and muscularis layer. The mucosa of anterior intestine forms high folds, which are lined with compactly arranged columnar epithelial cells and mucous cells. In the middle intestine, folds are pointless whereas the posterior intestine is without folds. The submucosa is formed of thin layer of connective tissue, contained collagen bundles and blood capillaries, comparatively well developed in the posterior intestine. By scanning electron microscopy, outlines of the luminal surface of anterior and middle intestine is embossed with oval or rounded columnar epithelial cells contained densely packed stubby microridges. The posterior intestine has closely set longitudinal folds characterized with minute blood capillaries and columnar epithelial cells having inconspicuous microridges. Ultrastructurally, the mucosal surface of the intestine consists of mucous cells with electron dense granules and columnar epithelial cells having numerous microvilli, mitochondria, endoplasmic reticulum, lysosomes and Golgi body. Cellular components of the anterior and middle intestine participate in the absorption whereas the presence of enormous blood vessels and capillary net work of posterior intestine probably responsible for air breathing.
冈茶泥鳅肠的组织学和超微结构研究(鲤形,石鳅科)
摘要利用光镜、扫描电镜和透射电镜对鳞头鱼(Lepidocephalichthys guntea, Hamilton, 1822)肠道的细胞组织进行了描述。肠短而直,根据粘膜褶皱、柱状上皮细胞和黏液细胞的数量和大小、粘膜下层和肌层的厚度分为前、中、后三区。前肠粘膜呈高褶皱,排列紧密的柱状上皮细胞和黏液细胞。中间肠没有褶皱,而后肠没有褶皱。粘膜下层由薄层结缔组织组成,含有胶原束和毛细血管,在后肠发育较好。扫描电镜下,前肠和中肠管腔表面的轮廓被椭圆形或圆形的柱状上皮细胞压花,柱状上皮细胞密集地排列成粗短的微脊。后肠具有紧密的纵向褶皱,其特征是细小的毛细血管和柱状上皮细胞具有不明显的微脊。在超微结构上,肠粘膜表面由具有电子致密颗粒的黏液细胞和具有大量微绒毛、线粒体、内质网、溶酶体和高尔基体的柱状上皮细胞组成。前肠和中肠的细胞成分参与吸收,而后肠的巨大血管和毛细血管网的存在可能负责空气呼吸。
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