Fig. 3 .

The front cover of Key A, Retzius G. Studien in der anatomie des nervensystems und des bindegewebes. Stockholm: Norstedt & Söner (1875) owned by Niigata University Library is shown. This article is always referenced when cerebrospinal fluid (CSF) absorption from the arachnoid granulation or villi is described. The detailed illustrations of the cerebral superficial subarachnoid space and Virchow-Robin space are key characteristics of this article. There are illustrations in which CSF eliminated from the subarachnoid space is present in the retro-orbital tissue and cervical lymphatic system, and there are also descriptions of anatomical findings that are widely suggestive of CSF absorption. Images of the copies are taken with the permission of Niigata University Library.