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对胎儿来讲分娩不是突然开始,需要一定的准备阶段.即在妊娠末期为适应胎外生活各脏器在机能上渐渐成熟,待获得自律性后等待临产.在这阶段胎儿肾上腺皮质起着重要作用.由胎儿肾上腺产生的皮质类固醇不但促进儿肺成熟,也促进肝、心糖原的贮藏及肠道酶的活化,对胎儿机能的成熟起重要作用.宫缩的产生考虑与胎儿垂体—肾上腺有关.绵羊和山羊在宫缩发生前,胎仔肾上腺皮质醇分泌亢进,另外,给促肾上腺皮质激素或皮质醇时,可引起早产,故认为生理性
The delivery of the fetus is not a sudden start, the need for a certain period of preparation, that is, in late pregnancy to adapt to the life expectancy of various organs of organ maturity, to be self-regulatory wait for labor .Fetal adrenal plays an important role in this stage The role of the fetus adrenal corticosteroids not only promote lung maturity, but also promote the liver and heart glycogen storage and intestinal enzyme activation play an important role in fetal function maturation of contractions and the fetus pituitary-adrenal Related to sheep and goats in the contractions before the fetus adrenocortical hyperthyroidism, in addition, to adrenocorticotropic hormone or cortisol, can cause premature birth, it is considered physiological