CIL:9303

This group of micrographs illustrate the ultrastructural characteristics of the middle layer of the three meningeal layers that cover the central nervous system The arachnoid cells contain abundant intermediate filaments that occupy a substantial volume of the cytoplasm. In some cells the intermediate filaments are organized into numerous coils of relatively uniform size and lie parallel to the outer surface of the central nervous system, such that sections cut tangential to the membrane surface (see CIL:9301) show the spirals but transverse sections such as this one do not. The plasma membrane of these cells has many caveolae. Adjacent arachnoid cells are connected by large desmosomes. Images were recorded using a Philips EM301 TEM at 80 kv. Original glass plates were scanned and digitized using an Epson V750 flatbed scanner with a step size of 15 micrometers. This group of images complement those published in the reference below. Reference: Michaels, JE, Tornheim, PA. Cell Tissue Res. 236:693-697 (1984).

本系列显微照片展示了覆盖中枢神经系统的三层脑膜之中层的超微结构特征。蛛网膜细胞内含有丰富的中间丝（intermediate filaments），其占据了细胞质的相当一部分体积。在部分细胞中，中间丝组装为大量尺寸相对均一的卷曲结构，并与中枢神经系统的外表面平行排布；因此，沿该膜表面切线方向制备的切片（参见CIL:9301）可观察到这些螺旋结构，但本图这类横切片则无法呈现。此类细胞的质膜上存在大量胞膜窖（caveolae）。相邻的蛛网膜细胞通过大型桥粒（desmosomes）相连。图像采用飞利浦（Philips）EM301透射电子显微镜（TEM）在80千伏电压下采集。原始玻璃底板通过爱普生（Epson）V750平板扫描仪以15微米的步距进行扫描并数字化。本图像集与下述参考文献中发表的图像互为补充。参考文献：Michaels JE, Tornheim PA. 《细胞与组织研究》. 236:693-697（1984年）