Abstract
In the ependyma of the IIIrd ventricle of the rat there are regional differences which are more complicated than those described in higher mammals. The mosaic-like structure of the ventricular wall can be particularly well demonstrated by enzyme-histochemical methods. The regional differences are shown to be correlated to special hypothalamic grisea, e.g. to the nuclei ventro-and dorsomedialis, periventricularis posterior and infundibularis or to the organon vasculosum laminae terminalis. It is thought that in these regions there are several “systems”, which are made up by hypothalamic grisea, their respective neuronal or neurohumoral connections, ependyma and blood vessels of the brain substance as well as of certain parts of the meninges. The role of the cerebrospinal fluid as a means of transport for certain substances is discussed.
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