-
Begins to exist when the sperm reaches the egg and fertilizes it, mixing it's genetic makeup with the eggs.
-
Fertilization
-
Pronuclei join together
-
Occurs when the 23 chromosomes from the male and 23 chromosomes from the female join together.
-
First round of mitosis (cleavage)
-
Second round of mitosis
-
Third round of mitosis
-
-
Occurs when the egg is implanted into the uterus and the developing of the embryo continues.
-
64 cell embryo called a blastocyst
-
This is when the blastocyst hatches from the zona pellucida.
-
Implantation
-
Ectopic pregnancy could occur
-
hCG begins to be secreted
-
Disc with streak on the underside forms mesoderm
-
First missed period
-
Neural tube forms
-
Heart begins to beat, arm & leg buds appear, yolk sac makes RBCs
-
Face plates forming
-
Cleft lip or palate may occur
-
Muscles form, bent neck, webbed hands and feet, segmented back
-
Fingers & toes separate, eyes & ears formed
-
Occurs when all organs are formed, muscles are developing, arms and legs are forming and eyes/face are also forming.
-
Genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus
-
Chorionic villi sampling could be performed
-
Amniocentesis could be performed
-
Eyes open, fat added under skin, head out of proportion to the body
