An Electron Microscopic Observation of Striated Filamentous Bundles Associated with Centrioles in Capillary Endothelial Cells of the Monkey Ciliary Muscle

Filamentous bundles associated with centrioles were occasionally observed in the capillary endothelial cells of the ciliary muscle of two crab-eating monkeys. They arise from one or both of a pair of centrioles and usually take a straight course either nearly parallel or rather perpendicular to the luminal surface of the endothelial cell. Sometimes, two bundles of filaments which originate from two different centrioles are fused into one thicker bundle. These bundles of filaments show a clear striation which consists of alternate dark narrow and light wide bands with a periodicity of 600 to 900Å. Furthermore, each light band indicates 7 or 9 alternate dark and light parallel subbands.