-
Hour 12
Fertilization -
Hour 12
First Rounds of Mitosis -
Hour 12-15
Morula Forms -
Fertilized Egg
Begins to exist when the sperm enters the egg -
Zygote Stage Begins
Begins when the sperm and egg make one individual cell -
hour 12-16
Pronuclei fuse -
hour 30-36
Second Round of Mitosis -
Hour 50-56
Third Round of Mitosis -
Day 4
Hatcing -
Day 6
64 Cell Embryo Called the Blastocyst Forms -
Ectopic pregnancy
Ectopic pregnancy can now occur -
Day 8-10
Implantation -
Day 12
hCG begins to be secreted -
Day 12
disc with streak on the underside forms mesoderm -
Day 15
First missed period -
Day 18
Neural Tubes form -
Day 18
The Heart begins to beat -
Day 21
arm & leg buds appear, yolk sac makes RBCs -
Embryo Stage Begins
Occurs when the ball of cells forms together -
Day 35
Face plates come together -
Day 21
cleft lip or palate may occur -
Week 6
muscles form, bent neck, webbed hands and feet, segmented back -
Fetal Stage
occurs when the embryo begins to form to have human like features -
Week 7
fingers & toes separate, eyes & ears formed -
Day 50
genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus -
Day 50
amniocentesis could be performed -
Week 10
chorionic villi sampling could be performed -
6-7 Months
eyes open, fat added under skin, head out of proportion to the body
