组织学与胚胎学课件(英文版).pptxVIP

Introduction to Human Embryology 1. What is Embryology？Fertilization Infant Nine months (266 days or 38 weeks to be exact) in the uterusZygotePrenatal periodGestational period 1. What is Embryology？Fertilization Infant Nine months (266 days or 38 weeks to be exact) in the uterusZygotePrenatal periodGestational period 1. What is Embryology？Prenatal periodEmbryonic periodFetal period 1. What is Embryology？Prenatal periodEmbryonic periodFetal period1. It extends from fertilization through 8 weeks2. The developing individual is called an embryo. 1. What is Embryology？Prenatal periodEmbryonic periodFetal period1. It extends from fertilization through 8 weeks.2. The developing individual is called an embryo.1. It extends from week 9 until birth.2. The developing individual is called a fetus. 1. What is Embryology？Embryology is the study of the formation and development of the embryo (or fetus) from the moment of its inception up to the time when it is born as an infant. Fertilization through 8 weeksEach of the first 3 weeks is characterized by specific developments. Week 1 starts with fertilization and extends through the first cell divisions that produce an embryo with one germ layer. Embryonic period 2-cell stage8-cell stage4-cell stage morula Early blastocystLate blastocyst Fertilization through 8 weeksEach of the first 3 weeks is characterized by specific developments. Week 1 starts with fertilization and extends through the first cell divisions that produce an embryo with one germ layer. Week 2 produces two germ layers. Embryonic period Fertilization through 8 weeksEach of the first 3 weeks is characterized by specific developments. Week 3 produces three germ layers and folds those layers into a recognizable three dimensional body.Embryonic period Fertilization through 8 weeksEach of the first 3 weeks is characterized by specific developments. Weeks 4 t