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This event occurs within fertilization and occurs in the first 12 hours
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Fertilization
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This occurs when the nuclear membrane of the ovum disappears and the 23 chromosome from the father and 23 chromosomes from the mother meet. The nuclei then double to make 46 chromosomes and fuse together
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pronuclei join together
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First round of mitosis (Clevage)
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second round of mitosis
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This begins when the third cleavage occurs and forms a morula
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Third round of mitosis
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64 cell embryo is now known as a blastocyst
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Implantation
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Ectopic pregnancy could occur
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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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Neural tube forms
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Heart begins to beat, arm and leg buds appear, yolk sac makes RBCs
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Face plates forming
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Cleft 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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Occurs when all organs are formed
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Amniocentesis can be performed
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Chronic villi sampling could be performed
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Eyes open, fat added under skin, head out of proportion to the body
