1. Human Fetal Development
Fertilization to Birth

2. Let’s make a chart Fold your paper in half like a hot dog (long ways)
Fold your paper in half like a hamburger (short ways)
Fold your paper in half like a hamburger again (short ways)
Open your paper up. You should have 8 boxes.

3. Human Developmental Timeline
Each box on your paper will represent a different stage in development
Title each box & copy the notes into that box
No, you do not have to draw the pictures…

4. Fertilization #1 Occurs in the fallopian tube
One sperm breaks through the egg’s outer membrane
Zygote

5. 1st Week of Development #2 Zygote leaves fallopian tube
Morula (solid ball of cells) enters the uterus
Blastocyst (day 5- hollow ball of cells) implants on the wall of the uterus
Morula
Blastocyst

6. Implantation #3 Happens about 9 days after fertilization
Blastocyst adheres to thick walls of uterus
Begins receiving nutrients and oxygen from mother so it can grow

7. #4
Embryo
3-8 weeks
Placenta develops (provides food and oxygen & removes wastes)
Amniotic fluid (cushions the embryo)
Umbilical cord (2 arteries and 1 vein- transfers blood from placenta to embryo/ fetus)
~5 wks

8. 1st Trimester #5 Now a Fetus
All tissues, organs, and organs systems develop
Highly vulnerable to outside influences (drugs & alcohol)
Can move arms

9. 2nd Trimester #6 Mostly growth 18-20 weeks- heartbeat
Hair forms & fetal eyes open

10. 3rd Trimester #7 Rapid growth Brain & nerve cell growth
Responds to sounds

11. Birth #8 Labor Birth Placenta delivered after
Uterine contractions begin
Cervix dilates to 10 cm
Birth
Uterus pushes baby through vaginal canal
Placenta delivered after
I’m free!