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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