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Fertilization
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Begins to exist when a sperm successfully penetrates the cytoplasm of the egg cell.
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Pronuclei join together
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Occurs when the nuclei of the sperm and egg join together
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First round of mitosis (cleavage)
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Second round of mitosis
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3rd round of mitosis
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64 Cell embryo called a blastocyst
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Implantation
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Ectopic pregnancy may occur
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Occurs when the blastocyst implants into the uterine lining
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Muscles begin to form, bent neck, webbed hands and feet, segmented back
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hCG begins to secrete
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Disc with streak on the underside forms mesoderm
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Neural tube forms
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First missed period
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Heart begins to beat, arm & leg buds appear, yolk sac makes RBCs
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Occurs during the end of the first trimester, when to fetus' organs begin to function properly
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Face plates form
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Cleft lip or palette may occur
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Fingers & Toes seperate, eyes and ears formed
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Genetalia 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 performed
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Eyes open, fat added under skin, head out of proportion to the body
