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人的个体发生是以受精或着床为起点.孕卵约于受精后6天着床,此后快速进行细胞学和化学变化,而达到生活旺盛的胎儿期,至受精后265日出生为新生儿.大多数胎儿在宫内发育顺利,但有时因发育规律失调引起胎儿自身发育障碍,即子宫内胎儿发育迟缓(IUGR),约占妊娠总数的6～8%.一、正常胎儿的发育1.子宫内胎儿发育的时间:正确的胎龄(embryonic age或fetal age)是指受精龄.临床上除体外受精外,获得真正的胎龄困难,因此产科多以孕周表示胎龄.但这只是从母体方面考虑,在胎儿方面应以胎生周
The onset of infertility or implantation of a human being begins at about 6 days after fertilization, and rapid cytological and chemical changes are followed to reach a viable fetus until 265 days after fertilization. Most of the fetus in the uterus successfully developed, but sometimes due to developmental disorders caused by fetal self-developmental disorders, that is, intrauterine fetal growth retardation (IUGR), accounting for 6 ~ 8% of the total number of pregnancies. First, the normal fetal development 1. Uterus Fetal development time: the correct gestational age (embryonic age or fetal age) refers to the age of fertilization clinically in addition to in vitro fertilization, the true gestational age to obtain difficulties, so obstetric more gestational gestational age, but only from Maternal considerations, the fetus should be viviparous weeks