几种无脊椎动物心肌超微结构的比较观察

Comparing Observation on The Ultrastructure of Myocardium from A Few Kinds of Inverterata

用透射电镜观察了软体动物中的毛蚶（Ａｒｃａ（Ａｎａｄａｒａ）ｓｕｂｃｒｅｎａｔａｌｉｓｃｈｋｅ）以及节肢动物门中的痕掌沙蟹（Ｏｃｙｐｏｄｅｓｔｉｍｐｓｏｎｉｏｒｔｍａｎｎ）、锯齿溪蟹（Ｐｏｔａｍｏｎｄｅｎｔｉｃｕｌａｔｕｓ）、螯虾（Ｐｒｏｃａｍｂａｒｕｓｃｌａｒｋｉ）四种无脊椎动物心肌纤维的超微结构。毛蚶的心肌呈平滑肌样，另三种甲壳动物的心肌都是横纹肌，但仍存在超微结构上的差别。本文从心肌组织结构上提供了节肢动物比软体动物高等的依据，并进一步讨论了无脊椎动物的心肌从平滑肌过渡到横纹肌是在软体动物到节肢动物的进化过程中完成的。

In this paper,the ultrastructures of myocardium fiber of four kinds of invertebrates are observed in electron microscope.These invertebrates are Arca(Anadara) subcrenata lischke in molluska,Ocypode stimpsoni ortmann,Potamon denticulatus and Procambarus clarkii in Arthropoda.It is found that the cardium fiber of Arca(Anadara) subcrenata lischke is smooth muscle,whereas the cardium fibers of other three kinds is striated muscle.But there are some differences in the ultrastructure of their cardium.In this paper,the basis that Arthropoda is superior to Molluska is given by the tissue structures of their cardium.Furthermore,we also discuss that the process from smooth muscle to striated muscle for the cardium of invertebrata is accomplished in the evolution from Molluska to Arthropoda.