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Fertilization
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Begins to exist when one sperm makes it through the zona pelucida leading to conception.
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Pronuclei join together
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Occurs when the pronuclei fuse.
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First round of mitosis (cleavage)
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Second round of mitosis
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Occurs when the mass of cells reaches eight and is called a morula.
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Third round of mitosis
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64 cell embryo called a blastocyst
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Ectopic pregnancy could occur
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Implantation
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hCG begins to be secreted
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Disk with streak on the underside forms mesoderm
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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 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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Occurs when all of the organs have been formed.
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Genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus
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Chorionic villi sampling could be performed
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Amniocentesis could be perfomed
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Eyes open, fat added under skin, head out of proportion to the body
