人胚胎早期发生.ppt

1、General embryology (I),1. Langmans Medical Embryology with Simbryo CD-ROM, Lippincott Williams & Wilkins Publishers 9th Edition2.高英茂主编，组织胚胎学，全国八年制教材，人民卫生出版社，20063.邹仲之，李继承主编，组织学与胚胎学，人民卫生出版社，20084.组胚精品课程网站：http:/ science which study the processes and regulations of development of human fetus.(from 1 c

2、ell (zygote合子) to (5-7) x1012 cells) total 38 weeks: preembryonic period（胚前期）: before 2 weeks,embryonic period（胚期）: 3-8 weeks,fetal period（胎儿期）: after 9 weeks,Fertilization（受精）,Definition: the process by which the male and female gametes(sperm and ovum) unite to give rise to zygotesite: in the ampul

3、lary region（壶腹部） of the oviduct,conditions: 1) maturation of oocyte 2)maturation of spermatozoa,3)capacitation （获能）and acrosome reaction（顶体反应） of spermatozoa capacitation factor: secreted by epi. cells of oviduct, capacity of releasing acrosome enzymes4)quality and quantity of spermatozoa: 2-6 ml, 1

4、00,000,000/ml, 30%; or capacity for mobile 70% 5) meeting of sperm and ovum within 24 hrs,Processes of fertilization:Phase I Penetration of the corona radiata（放射冠）, acrosomal releasePhase IIPenetration of the zona pellucide（透明带）ZP with receptors zona pellucida spongy the release of local enzymesPhas

5、e IIIEntrance, formation of zygote,Entry responseCortical or zona reactions -Compaction - impermeable to more spermOocyte finishes 2nd meiotic divisionMetabolic activation of the eggResults of fertilizationDiploidGenetic sexCleavage,Cleavage （卵裂）MitosisTwo cell stage (30h)Morula（桑椹胚） (72h)inner cell

6、 massembryoblastouter cell rimtrophoblastsBlastocyst （胚泡）(5d)BlastocoeleThe cells of morula secrete fluidZona pellucide disappears,Blastocyst （胚泡）,inner cell mass,blastocoele,trophoblasts,（滋养层）,（胚泡腔）,（内细胞群）,Puberty menstruation (28 days) Hormonal regulationGnRH FSHLHGranulosa/theca cellsEstrogens Pr

7、ogesteronesThe endometrium of the uterus is in the secretory phase,Uterus at Time of Implantation,Implantation（植入）-Passage through the uterine tubeDay 5 Day 11 UterusOrientation of implantationLocation - ant or post, fundusTrophoblasts overlying the embryoblast pole attach to the endometrium and beg

8、in to invade.,Processes zona pellucide disappear polar trophoblast touch the endometriumsecrete enzymes dissolve the endometrium embedded into endometrium coagulation plug seal the space,Implantation siteNormal:ant or post wall of the uterus, fundusAbnormal:Internal os of the cervix (placenta previa

9、)OvarianAbdominalTubal,Ectopic pregnancy,endometrium decidua: -decidua basalis （底蜕膜） -decidua capsularis（包蜕膜） -decidua parietalis（壁蜕膜）conditions: -endometrium is in secretory phase -morula reach the cavity of uterus on time -zona pellucide disappears in time,In vitro fertilisation,体外受精联合胚胎移植技术（IVF）：

10、又称试管婴儿，是指分别将卵子与精子取出后，置于试管内使其受精，再将胚胎前体-受精卵移植回母体子宫内发育成胎儿的过程。 生育年龄不孕妇女，具备下列任何一项时： 1经碘油造影、腹腔镜术或手术证实，各种原因引起的盆腔粘连或输卵管阻塞。 2双侧输卵管切除术后或结扎术后复通失败或不愿接受复通手术。 3盆腔子宫内膜异位症，反复促排卵治疗失败。 4顽固性多囊卵巢综合征，经反复促排卵治疗失败。 5不明原因不孕，反复促排卵治疗失败。,Preimplantation Genetic Diagnosis,植入前遗传学诊断(PGD)从发育到4-8细胞的胚胎中，取出一个细胞进行细胞遗传学或分子遗传学检查，再将检查结果正

11、常的胚胎放入子宫内,以达到优生优育目的。 目前主要用于已知患有遗传性疾患夫妇或高风 险遗传疾患携带者（如高龄妇女）。,Implantation - sinks deeperThe outer cell layerTrophoblastsCytotrophoblasts 细胞滋养层Syncytiotrophoblasts 合体滋养层Inner cell mass (embryoblast)Fluid collection amnionEpiblasts & hypoblasts,Bilaminar Germ Disc （二胚层胚盘） (Second week of development),We

12、ek two Day 9-12,ImplantationCovered the endometrium- fibrin plugComplete slight bulgeTrophoblastsVacuoles within syncytiotrophoblasts- fuse and form lacunar networksUteroplacental circExtra-Embryonic MesodermBtwn troph & cavitySomatic/splanchnic,Week 2 Day 13-14,TrophoblastsPrimary villiYolk sacPrim

13、ary to secondaryChorionic plateConnecting stalk,The Bilaminar Embryo,Disc btwn Amnion（羊膜腔）Yolk sac（卵黄囊）Bilaminar discEpiblasts（上胚层）Hypoblasts（下胚层）,End of the Week of Twos,2 major cell massesTrophoblasts Inner cell massTrophoblastsCytotrophoblastsSyncytiotrophoblastsEmbryonic CavitiesAmniotic cavityYolk sacGerm DiscEpiblastsHypoblasts,THE END!,