視床下部に於ける神経分泌の光による影響について

概要

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The purpose of the present experiment was to observe the effect of light upon the neurosecretion of the hypothalamo-hypophyseal system. The frogs and rats, after being kept in the dark or light room for varying periods of time, were killed either by decapitation or perfusion with the Zenkerformalin solution. Excized brains were fixed in the Zenker-formalin fluid and embedded in paraffin. 5μ thich serial sections were stained with the Gomori's chrome-alum hematoxylin phloxine method. The results obtained were as follows: 1) The frogs, kept in the dark for 1, and 4 days, showed an evidently increased number and size of the neurosecretory granules within the nervbe cells of the nucleus preopticus. Extracellular spaces of the nucleus also contained numerous large Gomori-positive droplets of globular or band shape. 2) The rats, exposed to light for 5 and 30 minutes, presented a decrease of neurosecretory granules. Keeping them on the dark room for 30 minutes resulted in an increase of the Gomori granules. These changes were most evidently demonstrated in the nucleus paraventricularis, less cvidently in the nucleus supraopticus, and hardly in the hypophyseal stalk and posterior lobe of the hypophysis.
社団法人日本動物学会の論文
1955-11-15