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16 cell (solid cell (Blastocyst (Trophoblast (Cytrophoblast (chrion…
16 cell
solid cell
(Morula)
Blastocyst
100+ cells
escape from ZP
implant
Trophoblast
Cytrophoblast
chrion
chrion villi
Syncytriotrophoblast
lacuna blood pools
ICM
Hypoblast
hypoblast
hypoblast
yolk sac
epiblast
epiblast
epiblast
8 cell
4 cell
2 cell
fertilized egg
pre nucleus female PLUS pre nucleus male
Meiosis 2 completion
3 polar bodies
penetration by sperm
2nd day Oocyte
"zygote"
"conceptus: developing organism
Includes: ZP + CR
oocyte + sperm cell
(0-30 Hrs)
rapid mitosis
S. Basali
Full placenta
hypoblast and epiblast join to make
embyonic disc
part of epiblast move towards primative streak and displaces to become endoderm
part of epiblast fills in b/w endoderm + primative streak = esoderm
a notochord rod forms
surface epiblast stay = ectoderm
occurring in Fallopian tubes
3 - 72 Hrs
3-4 days
amnion sae
HCG
3RD WEEK
day 0 - WK 8 = embryo WK 9 - birth = fetus