A&P CH20 Pregnancy, Growth, and Development
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| amnion | an extraembryonic membrane that encircles a developing fetus and contains amniotic fluid
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| chorion | extraembryonic membrane that forms the outermost covering around a fetus and contributes to formation of the placenta
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| cleavage | the early successive divisions of blastocyst cells into smaller and smaller cells
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| embryo | a prenatal stage of development after germ layers form but before rudiments of all organs are present
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| fertilization | the union of an egg cell and a sperm cell
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| fetus | a human embryo after eight weeks of development
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| gastrula | an embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells.
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| neonatal period | the first four weeks of life
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| placenta | structure that attaches the fetus to the uterine wall, providing for delivery of nutrients to and removal of wastes from the fetus
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| postnatal period | the period after birth
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| prenatal period | the period before birth
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| primary germ layers | three layers of embryonic cells that develop into specific tissues and organs, ectoderm, mesoderm, and endoderm
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| umbilical cord | cordlike structure that connects the fetus to the placenta
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| zygote | cell produced when an egg and a sperm fuse; fertilized egg
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