Development Stages of Human Embryo

Front

Fertilized egg that begins to divide from 2 cells to over 500

Back

ZYGOTE (1-2 Days)

Front

Zygote multiplies and forms blastocyst

Back

GERMINAL (Day 3-7)

Front

Blastocyst moves from fallopian tubes and implants in uterus

Back

GERMINAL (Day 3-7)

Front

Heart, muscles, ribs, backbone, and digestive tract begin to develop

Back

Embryo (Weeks 2-9)

Front

External body structure forms

Back

Embryo (Weeks 2-9)

Front

Baby is enclosed in amniotic sac

Back

Embryo (Weeks 2-9)

Front

Placenta and umbilical cord give nutrients to baby from mom

Back

Embryo (Weeks 2-9)

Front

Rapid increase in size

Back

TRIMESTER #1

Front

All organs should be present, although they are immature

Back

TRIMESTER #1

Front

Nostrils, mouth, lips, teeth buds, and eyelids form

Back

TRIMESTER #1