Prenatal development
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Prenatal development involves the development of the embryo and of the fetus during a viviparous animal's gestation. Prenatal development starts with fertilization, in the germinal stage of embryonic
An obstetric ultrasound monitor displaying a detailed sagittal profile view of a human fetus at 20 weeks and 5 days of gestational age.
A sperm cell fertilizing an egg cell
Human embryonic development
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Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular differentiation of the embry
Prenatal development
…is used to describe an unborn offspring at any stage of gestation. In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization, and continues as fetal development. By the end of the tenth week of gestational age, the embryo has acquired its basic form and…
Eight-cell embryo, at three days
Histogenesis of the three germ layers
Embryo attached to placenta in amniotic cavity
Nine-week-old human embryo from an ectopic pregnancy