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Fertilization
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First Rounds of Mitosis
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Morula Forms
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Begins to exist when the sperm enters the egg
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Begins when the sperm and egg make one individual cell
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Pronuclei fuse
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Second Round of Mitosis
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Third Round of Mitosis
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Hatcing
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64 Cell Embryo Called the Blastocyst Forms
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Ectopic pregnancy can now occur
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Implantation
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hCG begins to be secreted
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disc with streak on the underside forms mesoderm
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First missed period
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Neural Tubes form
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The Heart begins to beat
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arm & leg buds appear, yolk sac makes RBCs
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Occurs when the ball of cells forms together
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Face plates come together
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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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occurs when the embryo begins to form to have human like features
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fingers & toes separate, eyes & ears formed
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genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus
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amniocentesis could be performed
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chorionic villi sampling could be performed
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eyes open, fat added under skin, head out of proportion to the body
