山羊の甲状腺剔出が脳下垂体前葉並に造精機能に及ぼす影響

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In ordsr to prove the effect of thyroidectomy on the anterior pituitary (A. P.) and gonad, both throid glands in seven of eleven male goats were extirpated perfectly and A. P. and gonads were observed cytologically after the lapse of various periods.The semen was collected by electric stimulative method two weeks before operation as control and after operation twice a month till the time of slaughter.The results were as follows:(1) On the fiftieth day after thyrgidectomy cytolo-gical changes already appeared in the A. P, and particularly after three months enlarged.β-cells which were believed to be "thproidectomp-cells" were found.These cells showed degranulation, remarkable vacuolation and high secreting activity. The α-cells decreased in nunber and they showed degenerating forms.(2) There were no effect of thyroidectomy on the semen and on the testes in our histological observ ation.
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