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Fertilization
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Begins to exist when the sperm penetrates the cell membrane and enters the egg (fertilization).
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Pronuclei Join Together
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Occurs when the mother's and the father's chromosomes come together to form the baby's genetic makeup in one cell nucleus.
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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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Occurs when the baby becomes a morula.
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64 Cell Embryo Called a Blastocyst
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Implantation
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Ectopic Pregnancy Could Occur
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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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Neural Tube Forms
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First Missed Period
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Heart Begins to Beat, Arm and Leg Buds Appear, and Yolk Sac Makes RBCs
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Cleft Lip or Palate May Occur
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Face Plates Forming
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Muscles Form, Bent Neck, Webbed Hands and Feet, and Segmented Back
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Fingers and Toes Separate and Eyes and Ears are Formed
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Occurs when all organs are developed on day 49.
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Genitalia Begins to Differentiate, Eyelids Fuse, and 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, and Head Out of Proportion to the Body
