Neurosecretion and Anterior Pituitary Cells:III. Correlation between neurosecretion and cytological changes in the anterior hypophysis following castration in rabbits

スポンサーリンク

概要

• 論文の詳細を見る

• In castrated rabbits, neurosecretion is gradually augmented in the first month after castration. Great amounts of neurosecretory granules are released from the hypothalamic-neurohypophysial neurosecretory system (HNS) into the blood vessels and into the adeno-hypophysis. During later post-operative days, hypothalamic neurosecretory cells underwent, by turn, two phases, viz., a long hypersecretory and a short hyposecretory phase (or a resting period), suggesting a cyclic fluctuation of neurosecretory activity in castrated rabbits. At 8 months after castration, regressive degeneration occured in cells of both supraoptic and paraventricular nuclei and neurosecretory granules decreased greatly in the HNS. These changes in the neurosecretory system after castration were followed by histological changes in the adenohypophysis. Gonadotroph cells (positive in PAS-staining and negative in AF-staining) increased gradually in number and size in post-operative days and the secretion of granules was augmented em. Thyrotroph cells reduced in size, number, and density of granulation in post-operative days. In the 8th post-operative month when a great decrease was shown in neurosecretory granules in the HNS, these cells increased greatly in size and number. After castration the acidophils of the adenohypophysis increased slightly in number, while neuro-secretory granules increased in the first several days. Then the acidophils decreased in number by the increase in number and size of gonadotroph cells in later post-operative days.From the results obtained, it was postulated that the pituitary-gonadal system was under the control of the hypothalamic neurosecretion, and that the increase of neurosecretory substance in the adenohypophysis stimulated the production and release of the gonadotrophic hormones of the anterior pituitary.

• 公益社団法人 日本畜産学会の論文

公益社団法人 日本畜産学会 | 論文

• 低P飼料給与がめん羊の唾液流量,第1胃水分バランスおよび血液成分に及ぼす影響〔英文〕
• 親子鑑別における血液型の有効性 (豚の血液型に関する研究-5,6-)
• 着色羊毛の成因に関する研究-1-
• 子めん羊の皮膚温度の変化
• 羊の皮膚表面における蒸泄量について

もっと見る

スポンサーリンク