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A&P CH20 key terms

A&P CH20 Pregnancy, Growth, and Development

TermDefinition
amnion an extraembryonic membrane that encircles a developing fetus and contains amniotic fluid
chorion extraembryonic membrane that forms the outermost covering around a fetus and contributes to formation of the placenta
cleavage the early successive divisions of blastocyst cells into smaller and smaller cells
embryo a prenatal stage of development after germ layers form but before rudiments of all organs are present
fertilization the union of an egg cell and a sperm cell
fetus a human embryo after eight weeks of development
gastrula an embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells.
neonatal period the first four weeks of life
placenta structure that attaches the fetus to the uterine wall, providing for delivery of nutrients to and removal of wastes from the fetus
postnatal period the period after birth
prenatal period the period before birth
primary germ layers three layers of embryonic cells that develop into specific tissues and organs, ectoderm, mesoderm, and endoderm
umbilical cord cordlike structure that connects the fetus to the placenta
zygote cell produced when an egg and a sperm fuse; fertilized egg
 



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