背角无齿蚌晶杆的扫描电镜观察

OBSERVATION ON THE CRYSTALLINE STYLE OF A FRESHW ATER CLAM (ANODONTA WOODIANA)WITH SEM

本文应用扫描电镜的方法，对背角无齿蚌的晶杆进行了研究。结果表明：晶杆外形似圆柱状，可分为二部分，即前端膨大的头部和其后渐细的杆状部。前者分左右两瓣，略弯曲，与杆状部形成一个锐角，表面呈“蜂窝状”，似一种膜性结构，其上吸附有大量的消化酶和粘液；后者两侧有凹槽，表面具许多凹陷小坑，多为圆形或卵圆形，大小不一，深浅不同，且排列不规则。未凹陷处也粗糙不平。晶杆的功能主要是搅拌和消化食物。同时，本文对晶杆结构与功能的关系也进行了讨论。

This paper describes the structure of crystalline style of a freshwater clam(Anodenta woodiana) with scanning. electronic microscope (SEM). The results showed that the shape of crystalline style is same as column. The crystalline style of the clam could be divided into head and rob parts. The former is also divided into two sections. The head is winding slightly, forming an acute angle with the rob. The surface of the head was with honeycomb-like membrane, in which there were a great of enzymatic granule and mucus. The later was trough on both of the rob and had many hollows. The hollows are round or oval shape, which are different in size、depth and irregular in arrangement. Beside, they are also rough on the other surface of the rob. The function of the crystalline style is major of mixing and digesting food. The relationship between the structure and function of the crystalline style was also discussed.