Ultrastructural study of the final cerebrospinal fluid pathway in human arachnoid villi.


Human arachnoid villi were studied ultrastructurally to clarify the mechanism of cerebrospinal fluid absorption. Arachnoid villi of humans showed quite different features from those of animals. The former were not always invested with endothelial linings as previously reported in the latter. Instead, there was a covering layer of arachnoid cells which… (More)