Fetal Development

Fetal Stage

8 weeks to birth

Ovum

Zygote

Embryo

Fetus

Conceptus

Age of Viability

Ovulation

14

Fallopian tube

Fertilization

Ampulla

24 hours

Zona Pellucida

Corona Radiata

Implantation

Blastocyst

Placenta Previa

Decidua

Chorionic Villi

12

3

Progesterone

Estrogen

Chorion

Amnion

5

Umbilical Cord

Vein

Arteries

Nuchal Cord

Stem Cells

Ectoderm

Mesoderm

Endoderm