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首页> 外文期刊>Cell and Tissue Research >Structure, function and development of the digestive system in malacostracan crustaceans and adaptation to different lifestyles
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Structure, function and development of the digestive system in malacostracan crustaceans and adaptation to different lifestyles

机译:Malacostracan甲壳类动物中消化系统的结构,功能和发展,适应不同的生活方式

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The digestive system of the malacostracan crustaceans, namely the decapods, isopods, amphipods and mysids, is among the most complex organ systems of the animal kingdom serving multiple functions such as food processing, absorption and storage of nutrients, synthesis of digestive enzymes and blood proteins, detoxification of xenobiotics and osmoregulation. It is rather well investigated compared to other invertebrates because the Malacostraca include many ecological keystone species and food items for humans. The Decapoda and Peracarida share food processing with chewing and filtering structures of the stomach but differ with respect to morphology and ultrastructure of the digestive glands. In the Peracarida, the digestive glands are composed of few, relatively large lateral caeca, whereas in the Decapoda, hundreds to thousands of blindly ending tubules form a voluminous hepatopancreas. Morphogenesis and onset of functionality of the digestive system strongly depend on the mode of development. The digestive system is early developed in species with feeding planktonic larvae and appears late in species with direct lecithotrophic development. Some structures of the digestive system like the stomach ossicles are rather constant in higher taxa and are of taxonomic value, whereas others like the chewing structures are to some degree adapted to the feeding strategy. The nutrient absorbing and storing cells of the digestive glands show considerable ultrastructural variation during moult cycle, vitellogenesis and starvation. Some of the various functions of the digestive system are already assigned to specific sections of the digestive tract and cell types, but others still await precise localization.
机译:Malacostracan甲壳类动物的消化系统,即褥疮,异府植物,Amphipods和Mysids,是动物王国的最复杂的器官系统中,用于多种功能,例如食品加工,吸收和营养,消化酶和血液蛋白的合成,异恶菌和Osmoreculation的排毒。与其他无脊椎动物相比,它是相当良好的调查,因为MalacostraCa包括许多生态基石物种和用于人类的食品。褥疮和腓高加共享食物加工,胃的咀嚼和过滤结构,但与消化腺体的形态和超微结构不同。在peracarida中,消化腺由少量,相对较大的外侧Caeca组成,而在脱矶oda中,数百至数千次盲目的末端小管形成一大堆肝脏。消化系统的形态发生和发病性强烈取决于发展方式。消化系统早期在具有喂养浮游生物幼虫的物种中发育的,并且在具有直接卵磷脂发育的物种晚期出现。像胃骨粒子一样的一些结构在较高的分类群中是恒定的,并且具有分类价值,而其他类似咀嚼结构的其他结构是适应饲养策略的程度。消化腺的营养吸收和储存细胞在换羽期间显示出相当大的超微结构变异,vitellogis和饥饿。消化系统的一些各种功能已经分配给消化道和细胞类型的特定部分,但其他部分仍在等待精确的本地化。

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