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3.02 Prenatal Development

pregnancyThe period during which a fertilized egg grows and develops into a human being inside the mother’s body
trimesterA period of about three months
ovumA woman’s egg
ovulationOnce a month a woman’s egg is released from the ovaries
spermMale cell needed for reproduction
conceptionSperm and ovum unite; also known as fertilization
zygoteFertilized human egg; the zygote stage lasts from conception to two weeks
embryoThe developing baby from about the third week of pregnancy through the eighth week
fetusThe final stage of pregnancy from the ninth month until birth
prenatal developmentAll development that occurs between conception and birth
amniotic fluidA fluid that cushions the baby against possible injury, allows the baby to move around easily, and regulates the baby’s temperature
amniotic sacThe sac that holds the amniotic fluid
umbilical cordA flexible cord that contains blood vessels and connects the baby to the placenta
placentaA special organ that functions as an interchange between the developing baby and its mother providing nutrients and blood to the fetus
blastocystA hollow ball of cells from the fertilized egg that implants itself into the uterus lining
lighteningThe process or time during late pregnancy when the fetal head begins to descend into the mother’s pelvis, resulting in a lessening of pressure on the diaphragm
quickeningTo move and be felt moving in the womb
uterusA hollow muscular organ in the pelvic cavity of the female, in which the embryo is nourished and develops before birth
lanugoSoft prenatal hair, usually shed in the 7th to 8th month
vernix caseosaWaxy or "cheesy" white substance found coating the skin of newborn humans

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