PRENATAL DEVELOPMENT

Conception (Fertilization) Joining of the egg and sperm

Egg ( ovum) I released each

month from the ovary

23 chromosomes

Sperm 23 chromosomes When Sperm and

egg unite we have what is called the zygote ( human cell)

Fertilization

46 chromosomes = zygote has all the genetic material.

Stage 1: Period of the Zygote Conception until 2 weeks old. Zygote travels from fallopian tube to

uterus This is a time of rapid cell division The zygote is nourished from the cell

and secretions in the fallopian tube and uterus.

Implantation: Occurs when the zygote attaches to the

thickened lining in the uterus. This lining nourishes the zygote ( therefore

no menstruation)

Stage 2: Period of the Embyro: 2 weeks to about 8 weeks During this stage all organs and

systems of the baby are made or developed

3 essential structures are formed 1) Placenta

Carries O2 and food to baby Carries CO2 and waste to the mother Stores nutrients ( iron, calcium, protein) Carries infections, antibodies, nicotine, liquor,

and drugs to the baby

2) Umbilical Cord Connects embryo to the placenta

Amniotic Sac Filled with fluid that acts as a shock

absorber for minor bumps and falls of themom, equalizes the pressure and provides nourishment.

Stage 3: Period of the fetus From 8- 40 weeks or birth Organs and systems grow and

mature Quickening ( 4th to 5th month) mom

feels life