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38 Cards in this Set
- Front
- Back
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zygote is occurs in what day
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day 0
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zygote is formed from what?
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its basically a fertilized egg. remember fertilization is the fusion of the an egg and sperm
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during day day 0 does the zygote growth
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no, it just divides to form blastomeres
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zygotes form what in day 0?
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blastomeres
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describe day 0 of embryonic development
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zygote is formed from fertilization which is the fusion of sperm and egg. The zygote cells do not grow but instead divide into blastomeres which are small cells
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what is a morula?
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a morula is when the zygote divides into 32 cells
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how many cells does the zygote divide into in day 3
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32 cells (morula)
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what happens in day 3
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the zygote divides into 32 cells. This is known as morula
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what is a blastocyst?
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hollowed out morula
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what are the components of a blastocyst?
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inner cell mass and outer trophoblast layer
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the inner cell mass of a blastocyst forms what?
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embryonic body
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embryonic body forms from _________
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inner cell mass of blastocyst
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the trophoblast of a blastocyst forms what?
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chorion and placenta
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what is the outer layer of the blastocyst called?
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trophoblast
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chorion and placenta of a zygote forms from what?
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from trophoblast of blastocyst
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describe day 4-6?
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this is known as the blastocyst period. A blastocyst consist of an inner cell mass and an outer trophoblast. The inner cell mass forms embryonic body. The trophoblast forms the chorion and placenta
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what is implantation?
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implantation is when blastocyst attaches to uterine wall
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what happens in day 7?
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blastocyst implants with inner cell mass, trophoblast secrete enzymes, chorionic villi and uterine tissue form placenta, as blastocyte grows it forms amnion, yolk sac, and allantois
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what are the 3 embryonic layers
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amnion, yolk sac, and allantois
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what is amnion?
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encases embyro and protects it from trauma, temp, and adhesion due to rapid embryonic growth
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what layer forms the embryos first blood cells
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yolk sac
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what is the function of the yolk sac?
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it forms the embryo's first blood cells; primordial germ cells migrate to embryo to form and become germ cells in gonadal tissue
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what embryonic layer helps form umbilical cord
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allantois
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what is the purpose of the the allantois embryonic layer?
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to form the umbilical cord
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the attachment of blastocyst to uterine wall is known as
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implantation
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embryo is referred to as what in week 9
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fetus
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what is the major focus of development at week 9
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fetal growth and tissue specialization
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this is a uterine mucosa layer that envelops an embryo
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decidua capsularis
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uterine wall beneath inner cell mass that will form part of placenta ___________
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decidua basalis
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3 primary germ layers are present and begin to differentiate during what stage
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gastrula stage
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what are the 3 primary germ layers present during gastrula stage?
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endoderm, ectoderm, mesoderm
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what is endoderm?
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forms mucosa of digestive/respiratory systems and glands
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What is the function of ectoderm?
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forms skin/nervous system
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what is the function of mesoderm?
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forms everything in between such as skeleton, skeletal muscles, wall of GI organs, urinary/circulatory system
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this primary germ layer forms the skin and nervous system
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ectoderm
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this primary germ layer forms the mucosa of the digestive and respiratory system
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endoderm
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this primary germ layer forms skeleton, skeletal muscles, walls urinary/circulatory/digestive organs and everything in between
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mesoderm
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what happens in day 14 of embryonic development?
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decidua capsularis and decidua basal is forms. Decidua capsularis envelops the embryo. Decidua basal is forms part of placenta
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