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| between the 7th and 9th days after fertilization when the blastocyst burrows deep into the unterine lining |
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| a membrane formed that encloses the developing organism in amniotic fluid which helps keep the temperature of the prenatal world constant and provides a cushion against any jolts caused by the women's movements. |
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| another protective membrane which surrounds the amnion and has tiny hair like villi, or blood vessels. |
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| an object that brings the embryo's and the mother's blood close together but prevents them from mixing directly providing food and oxygen to reach the organism and waste products to be carried away. |
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| contains one large vein which delivers blood loaded with nutrients, and two arteries, which remove waste products. |
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| The stage from implantation through the eighth week of pregnancy in which the groundwork is laid for all body structures and organs. |
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| when the ectoderm folds over and becomes the spinal cord and brain. |
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| the stage from the 9th month to the end of pregnancy, the longest prenatal period. |
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| a period of time in which prenatal development is divided into. |
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| a white cheeselike substance that protects its skin from chapping during the long months spent bathing in the amniotic fluid. |
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| White, downy hair that appears over the entire body, helping the vernix stick to the body. |
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| the point at which the fetus can first survive. Occurs somewhere between 22 and 26 weeks. |
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| refers to any enviromental agent that causes damage during the prenatal period |
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| Mental retardation; impaired motor coordination, attention, memory, and language; and overactivity are typical of children with the disorder. |
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Term
| Fetal Alcohol Effects (FAE) |
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Definition
| seen in children of mothers who generally drank alcohol is mall quanities, affected individuals display only some abnormalities. |
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Term
| Rh factor incompatibility |
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Definition
| When the mother is Rh negative and the father is Rh positive the baby may inherit the father's Rh positive blood type. |
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