“…Moreover, Van Dyke, Bailey & Buey (1929) 3rd ventricle. Such light-microscopical studies on both mammals and sub-mammalian vertebrates have been published by Hild (1951), Bargmann (1954Bargmann ( , 1955, Stutinsky (1953), Okamoto (1957), Talanti & Kivalo (1961), Eichner (1963) and Dierickx (1964), and many of the authors suggest that the neurosecretory material is secreted into the CSF. These light-microscopical findings are supported by electron-microscopical investigations (Brightman & Palay, 1963;Smoller, 1965;Nishioka, Bern & Mewaldt, 1964;Leonhardt & Lindner, 1967).…”