[Formation of a reaction of the hypothalamo-hypophyseal-adrenal cortex system to cooling in chick embryogenesis].
The content of glucocorticoids in the suprarenals and blood of chick embryos increased from the 12th till the 15th day of incubation. The intensive accumulation of glucocorticoids in the glands was accompanied by a relatively small increase of their concentration in blood plasma from the 15th till the 19th day. No adrenocortical reaction to cooling was registered in the 12 and 13 days old embryos. Upon cooling of 15-19 days old embryos the content of glucocorticoid hormones in the suprarenals decreased 2 to 3 times. It is suggested that the relationships between hypothalamus, hypophysis and suprarenal cortex are developed within the last week of embryogenesis. The combination of the ability for reaction with the incompletion of integration creates specific conditions for imprinting of external influences in the hypothalamic-hypophysial-suprarenal system.
D000375:Aging; D000818:Animals; D002642:Chick Embryo; D003080:Cold Temperature; D005938:Glucocorticoids / Q000097:blood; D007030:Hypothalamo-Hypophyseal System / Q000196:embryology*; D007173:Imprinting, Psychological / Q000502:physiology; D010913:Pituitary-Adrenal System / Q000196:embryology*
D005938:Glucocorticoids
Formirovanie reaktsii gipotalamo-gipofizarno-adrenokortikal'noĭ sistemy na okhlazhdenie v émbriogeneze kur.