课件：组培人体胚胎学.ppt

Chromosome analysis can determine the parental source and the defective chromosome and provides a basis for diagnosis an possible treatment (2)Contraceptive techniques interfere with a wide variety of reproductive mechanisms受精与节育和不孕不育 Despite the high rate of spontaneous abortion, human reproductive efficiency is very high. Methods : （1）Barrier contraceptives prevent the sperm from reaching the egg.(2)The birth control pill prevent ovulation.(3)injected or implanted sources of progestin deliver a chronic antiovulatory dose. （ (4)Nonmedicated IUDs may interfere with conception through effects on both sperm and egg. (5)The antiprogesterone compound RU-486 is an abortifacient . (6) sterilization is used by about one third of american couples. (7)new methods of contraception are needed. Infertile(15%-30%in American ) The maturation of human gametes and early embryos can now be supported outside the body to assist infertile couples. An oocyte can be fertilized in vitro and then implanted in the uterus. In vitro fertilization and embryo transfer(IVF). Gametes or zygotes can be introduced directly into the ampulla of the oviduct. 后面内容直接删除就行 资料可以编辑修改使用 资料可以编辑修改使用 主要经营：网络软件设计、图文设计制作、发布广告等 公司秉着以优质的服务对待每一位客户，做到让客户满意！ 致力于数据挖掘，合同简历、论文写作、PPT设计、计划书、策划案、学习课件、各类模板等方方面面，打造全网一站式需求 * * * * 人体胚胎学Human embryology 主讲人： 苏衍萍 20 Preface 1.Definition:(定义) Study development and mechanism of human body from fertilization to birth. 2. Content(内容) (1) Normal human body development in uterus.(胚胎发育) (2)Relation between mother and embryo. (母子关系) (3) Hereditary malformation and reproductive engineering(先天畸形与生殖工程) 3、 胚胎分期 (1)preembryonic period(胚前期) fertilization to —2W (2)embryonic period(胚期) 3W—8W (sensitive period of teratogenesis,致畸敏感期) (3)fetal period(胎儿期) 9W—birth *perinatal period(围产期) 26W--4W after birth 受精 8周末 胚期 胎期 围产期 （ 1-8周） （9-38周） (26周-生后4周) 出生 受精、卵裂、 器官系统发育、 胚泡形成、