[The three dimensional structures of the external collector channels in human adult eyes]

The three dimensional structures of external collector channels in 13 human adult eyes were studied by the ABS (allylcyanide, butadiene and stryrolene) cast technique under the scanning electron microscope. The beginning sites of external collector channels are of 4 types: (1) the cone type, (2) the hook type, (3) the V type, and (4) the arch type. By the characteristics of the inner surface, the external collector channels are again of 2 types: (1) the smooth type, and (2) the rugous type. Impressions of the endothelial cell nuclei at the beginning sites and narrow annuli at the root of the collector branches were also observed. The probable significance of the morphological structures were discussed.