鷄の松果體の研究 : 第II報鷄の松果體の細胞發生學的研究

概要

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About 130 materials of various stages have been used in this study. The results of observations are as follows:1) The parenchymatous cells of the pineal body are derived from the ectodermal ependyma cells, while the stroma of the body are formed by the mesenchyme together with the neuroglia and acidophilic granule cells.2) The parenchymatous cells of the pineal body contain the basophihc granules which have been discharged in various functional stages of the cells. These observations have support the idea that the cells are the secretory type.On the other hand. grocups of special type of degeneration cells hitherto undescribed) aru found scattered among the ordinary parenchymatous cells They are finally change themselves into the lipoidal substance.Thus, the pineal body of the fowl seems to have both secretory types of merocrine and holocrine gland.3) The secondary follicular formation of the cells has oeen observed. The formation begins with the degenetation of the cells which lie in the center of the cell cluster. The cells surrounding the follicular cavity change into the peseudo. ependyma.4) The pigment cells (which supposed to contain the lipopigment) appear among the ord. inary parenchymatous cells of the pineal body, in the later developing stages of the embryos and maintain their existence throughout their lives hereafter.
社団法人日本畜産学会の論文