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8 Cards in this Set
- Front
- Back
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Pre-embryonic stage
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Zygote-Mitosis
Clevage: begins dividing Morula-branch of cells-froms the blastocyst; beginning of the cells arranging themselves in layers. Inner layer (Embryo) referred to as chorion |
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Embryonic stage
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Beginning of 2nd week- Implantation begins implantation usually in the uterus. Yolk sac is formed, amnotic cavity forms
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ectoderm
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outer layer becomes skins, lining of rectum & nervous system
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Mesoderm
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middle layer- skeleton, muscular system, cardiovascular, urinary
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Endoderm
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inner layer- Epillelial lining of digestive tract and respiratory tract
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3rd week
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Nervous system develops; neural tube becomes brain and spinal cord.
Heart is formed; pumps blood |
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4th & 5th week
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1st formation of the body stocked becomes umbillical cord.
Limb buds forms Head forms |
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6-8 weeks
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Embryo looks human reflex action begins
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