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Zygote (fertilized egg)
Early blastocyst (Morula hollows out, fills with fluid, and “hatches” from the zona pellucida). 4 days
Sperm
Uterus
Blastocyst cavity
Uterine tube
Ovulation
Blastocyst cavity
Cavity of uterus
Ovary
Trophoblast
Morula (a solid ball of blastomeres). 3 days
Oocyte (egg)
4-cell stage 2 days
Implanting blastocyst (Consists of a sphere of trophoblast cells that an eccentric cell cluster called the inner cell mass). 7 days
Endometrium
Inner cell mass
Fertilization (sperm meets and enters egg)
Amniotic cavity
Amnion
Primary germ layers
Chorionic villus
Endometrium
Endometrial epithelium
Yolk sac
Amniotic cavity
Chorionic villus
Endoderm
Mesoderm
Forming umbilical cord
Decidua basalis
Lumen of uterus
Amnion
Amniotic cavity
Yolk sac
Chorion
Allantois
Ectoderm
Umbilical blood vessels in umbilical cord
Chorion being formed
Chorion
Decidua capsularis
Umbilical cord
Umbilical cord
Yolk sac
Amnion
Fetal venule
Umbilical arteries
Fetal portion of placenta (chorion)
Decidua basalis
Amniotic cavity
Chorionic villus containing fetal capillaries
Fetal arteriole
Myometrium
Maternal portion of placenta (decidua basalis)
Umbilical vein
Placenta
Amnion
Uterus
Decidua capsularis
Stratum basalis of endometrium
Chorionic villi