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受精卵(zygote), embryonic pole胚胎極 - Coggle Diagram

- - - - exocoelomic membrane
      - extraembryonic mesoderm胚外中胚層(血管生成來源)
        
        extraembryonic coelomic spaces
        
        chorionic cavity絨毛膜腔
        
        extraembryonic splanchnic mesoderms (較內側，貼近umbilical vesicle)
        
        extraembryonic coelom
        
        extraembryonic somatic mesoderms (較外側，貼近trophoblast&包圍在amnion外面)
    - - epiblast
        
        bilaminar embryonic disc
        
        trilaminar germ disc
        
        mesoderm
        
        bone
        
        muscle
        
        ectoderm
        
        nerve
        
        skin
        
        endoderm
        
        消化道
        
        呼吸道
        
        amnion羊膜
        
        amniotic cavity羊膜腔
        
        primitive streak原條
        
        primitive pit原凹
        
        notochordal process
        
        primitive node 原結
        
        primitive groove原陷
        
        在第四週左右消失
        
        未消失會形成sacrococcygeal teratoma
  - - - primary umbilical vesicle (primary yolk sac)
        
        secondary umbilical vesicle
        
        yolk sac
        
        primary umbilical vesicle
        
        gone消失
  - - - chorionic sac =chorion絨毛膜
      - primary chorionic villi
        
        secondary chrionic villi
        
        tertiary chorionic villi
        
        mesenchymal core
    - - 分泌human chorionic gonadotrophin (hCG)
      - 分泌enzyme : protease、collagenase等，分解細胞外間質(extracellular matrix)
      - 產生lacunae(讓母體血液流入)
        
        lacunar network