Germ disc form and differentiate?胚层的形成和分化Р主讲人: 苏衍萍Р1、Development of the bilaminar germ disc?(二胚层的形成,2w):?(1)二胚层胚盘?(bilaminar germ disc)。?上胚层(epiblast)? 下胚层(hypoblast)? ? ? 羊膜腔(amniotic cavity),? 卵黄囊(yolk sac)。Р羊膜腔Р上胚层Р下胚层Р卵黄囊Р体蒂Р(body stalk)Р(2)The amniotic cavity develops within the epiblastР上胚层Р下胚层Р(3)The formation of the yolk sac(卵黄囊形成)Р初级卵黄囊Р胚外中胚层的网状组织РOn days 10 to 11, an acellular extraembryonic reticulum form between Heuser’s membrane and the cytotrophoblast.Р下胚层形成次级卵黄囊Р2、三胚层的形成(第3周)?(1)The primitive streak appears at the beginning of the third week(原条的出现,3w)?原条 primitive streak?原结 primitive nodeА原凹 primitive pit? 原沟 primitive grooveР两胚层胚盘背面观Р原条Р外胚层Р羊膜切缘Р口咽膜Р内胚层Р口咽膜Р胚盘Р脊索突Р原结Р原条Р泄殖腔膜Р中胚层
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