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Fertilization
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Begins to exist when sperm reaches the egg
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Pro-nuclei join together
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Occurs during the first 2 weeks of development and moves along the Fallopian tube towards the uterus. The ovum disappears and it is the making of 23 chromosomes preparing to divide.
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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 egg is divided into morula before it becomes a blastocyst.
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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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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 tubes forms
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Heart begins to beat, arm & legs buds appear, yolk sac makes RBC's
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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, segmented back
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Occurs when all organs are formed and are prepared to differentiate.
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finger & toes separate, eyes & ears formed
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genitalia begins to differentiate, eyelids fuse, amnion surround fetus
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chronic 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
