child syc chapter 3
Terms
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The zygote 4 days after fertilization, when the tiny mass of cells forms a hollow, fluid-filled ball.
- Blastocyst
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a small cluster of cells on the inside of the blastocyst, from which the new organism will develop.
- embryonic disk
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- The thin outer ring of cells of the blastocyst, which will become the structures that provide protective covering and nourishment to the new organism.
- trophoblast
- Attachment of the blastocyst to the uterine lining, which occurs 7 to 9 days after fertilization.
- Implantation
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- The inner membrane that encloses the prenatal organism.
- Amnion
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The fluid that fills the amnion, helping to keep temperature constant and to provide a cushion against jolts caused by the mother’s movement,
- amniotic fluid
- The outer membrane that surrounds the amnion and sends out tiny, fingerlike villi, from which the placenta begins to develop.
- chorion
- The organ that permits exchange of nutrients and waste products between the bloodstreams of the mother and the embryo, while also preventing the mother’s and embryo’s blood from mixing directly.
- placenta
- A white, cheesehke substance that covers the fetus, preventing the skin from chapping due to constant exposure to amniotic fluid.
- vernix
- White, downy hair that covers the entire body of the fetus, helping the vernix stick to the skin.
- lanugo
- the earliest age at which the fetus can survive if born prematurely, occurring sometime between 22 and 26 weeks.
- age of viability
- any enviormental agent that causes damage during the prenatal period
- teratogen
- a range of physical, mental and behavioral outcomes caused by prenatal alcohol exposure
- FASD
- the most severe FASD, distinguished by slow physical growth, facial abnormalities, and brain injury. usually seen in children whose mothers consumed large amounts of alcohol during most or all of pregnancy
- FAS
- three day or german measles; responsible for a wide variety of prenatal abnormalities especially when it strikes during the embryonic period.
- rubella
- a viral infection that destroys the immune system and is spread through the transfer of body fluids from one person to another, as well as prenatally
- AIDS