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Begins to exist when the sperm enters the egg
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pronuclei join together
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fertilization
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begins when the egg has been fertilized and is on its way to the uterus
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first round of mitosis (cleavage)
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second round of mitosis
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third round of mitosis
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ectopic pregnancy
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64 cell embryo called a blastocyst
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implantation
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begins after implantation
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disc with streak on the underside forms mesoderm
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HCG begins to be secreted
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first missed period
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heart begins to beat, arm and leg buds appear, yolk sac makes RBC's
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neural tube forms
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face plates forming
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cleft lip or palate may occur
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muscles form, bent neck, webbed hands and feet, segmented back
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fingers and toes separate, eyes and ears formed
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genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus
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is characterized by exponential growth of the baby
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chorionic villi sampling could be performed
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amniocentesis could be performed
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eyes open, fat added under skin, head out of proportion to the body
