Term
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Definition
| Normal number of chromosomes (46) in non-reproductive cells |
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Term
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Definition
| An ovum or spermatatozoon |
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Term
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Definition
| Normal number of chromosomes (23) in each mature sperm or ovum |
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Term
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Definition
| Cell division in sex cells |
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Term
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Definition
| Cell division in non-sex cells to allow for growth & replacement of cells |
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Term
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Definition
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Term
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Definition
| The formation of spermatozoa |
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Term
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Definition
| Body chromosomes, 22 pairs (does not include 1 pair of sex chromosomes, which would make a total of 23 pairs or 46 chromosomes) |
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Term
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Definition
| Nongenetic factor that can cause malformatations of the fetus, Maternal drug use (illegal, OTC & some prescribed) |
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Term
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Definition
| Inner fetal membrane the envelops the embryo & fetus |
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Term
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Definition
| Zygote containing an inner cell mass that will develop into the embryo |
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Term
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Definition
| Eight-cell stage of prenatal development |
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Term
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Definition
| Outer fetal membrane that envelops the amnion & embryo/fetus |
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Term
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Definition
| Uterine lining after implantation that gives rise to the maternal side of the placenta |
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Term
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Definition
| Prenatal development from the 2nd week to the end of the 8th week after fertilization |
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Term
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Definition
| Prenatal development from the 9th week until birth |
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Term
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Definition
| Solid cluster of cell that approximately the same size as the zygote |
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Term
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Definition
| Projections on the outer part of the fetal side of the placenta that extend into decidua basalis |
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Term
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Definition
| A cell form by the union of a sperm and ovum |
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Term
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Definition
| Identical twins, same sex |
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Term
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Definition
| Fraternal twins, may be same sex or opposite |
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Term
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Definition
| Tempory organ for fetal respiration, nutrition & excretions. Forms when chorionic villi extend into decidua basalis |
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Term
| Human Chorionic Gonadotropin (hCG) |
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Definition
| Signal the corpus luteum that conception has occured & cause it to contiue to produce estrogen & progesterone. Detectable in blood as soon as implantation occurs (7-9 days)is the basis for most PG test |
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Term
| Human Placental Lactogen (hPL) |
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Definition
| Cause decreased insulin sensitivity & utilization of glucose by the mother, making more available to the fetus for growth |
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Term
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Definition
| Diverts some blood away from the liver as it returns from the placenta, closes functionally when umbilical cord is cut at birth & permanently after 1 week |
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Term
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Definition
| Diverts most blood from the right atrium to the left, rather than circulating through the lungs, stops function less than 2hr after birth & permanently at about 3 months |
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Term
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Definition
| Diverts most blood from the pulmonary artery into the aorta, function stop within 15hrs after birt & pemanently in about 3 weeks |
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Term
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Definition
| Forms in the blastocye in about 9 days, it functions only in embryonic life & iniates RBC production for about 6weeks until the liver can produce RBC's |
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Term
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Definition
| Formed by the chorion & amnion together, fill with fluid that permits the embryo to float freely, maintain temperature, prevents amniotic sac from adhering to fetal skin, allows symmetrical growth & acts as a cushion to protect fetus & umbilical cord |
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Term
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Definition
| Normally at 20 weeks lungs have developed enough for the fetus to survive outside of the uterus |
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Term
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Definition
| Lifeline between mother & Fetus, contains 2 arteries to carry blood away fro the fetus & 1 vein to carry blood to the fetus |
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Term
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Definition
| Covers & cushions the cord vessels and keep the 3 vessels separated. Vessels are coiled to allow movement & stretching without restricting circulation |
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