【医学生物PPT】组织胚胎学课件#40;4#41;.pptxVIP

组织胚胎学课件中国医科大学 基础錄院组胚一英文駁学组业精于勤荒于嬉行成于思毁于随 ，【医学生物PPT,欢迎收藏分享】 豆丁网友■HUMANEMBRYOLOGYDepartment of Histology and Embryology .J *■China Medical University.R, ■Chapter 4\ ■ ■: .? ：.「 . ?? * . ? 二 . , . .Further Development of EmbryoFormation and differentiation of trilaminar germ disc!? formation of epiblast and hypoblast:By the 8th day, the inner cell mass differentiates into two layers of cells{epiblast (columnar)hypoblast (cuboidal) \Amnionic —cavity epiblast I hypoblast IBilaminar germ disc???epiblast: primary ectoderm amniotic cavity: amniotic fluid {roof: amniogenic cells floor: epiblastAmniogenic cellsAmniotic cavityPrimaryyolk sacCavity of blastocyst…hypoblast: primary endoderm hypoblast 一 Heusers membrane 一primary yolk sacAmniogenic cellsAmniotic cavityPrimaryyolk sacCavity of blastocystAmnionic cavityr epiblast hypoblastBilaminar germ discExtra-embryonic mesodermPrimary yolk sac°斯| secondary yolk sacBody stalkExtra-embryonic cavityExtra-embryonic mesodermPrimary yolk sacextra-embryonic mesoderm — extra-embryonic cavity (chorionic cavity)—visceral layer—parietal layer/secondary yolk sac: yolk sac???body stalk (connecting stalk): formed by extra-embryonic mesoderm2. formation of mesoderm:in the early of the 3rd week???primitive streak: cells of epiblastproliferate to form a longitudinal arranged cell cord* determination of head and tail of germ disc2. formation of mesoderm: in the early of the 3rd week…primitive streak——primitive node primitive knot2. formation of mesoderm: in the early of the 3rd week——primitive streak:primitive node primitive knot)???primitive pit blastoporePrimitivePrimitivenodestreakAmnioblastsYolk sacInvaginating mesoderm cellsHypoblast—mesoderm: intra-embryonic mesoderm-??■endoderm: hypoblast cells are replaced by epiblast cells???ectoderm: epiblast changed the name into ectodermPrimitive streakYolk sacEndodermExtra-embryonic coelomby the end of the 3rd week1】trilaminar germ disc:endoderm + mesoderm + ectodermPrimitive streakExtra-e