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Notes 020608 - th week till birth 1 Period of the Ovum...

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**TEST WEDNESDAY 2/13** UP TO THE TOP OF PAGE 119 BRING A #2 PENCIL HDFS 129 February 6, 2008 G. Prenatal Testing Routine tests Multiple Marker Screen (= Triple Screen) – 3 hormones Ultrasound Amniocentesis – needle – withdraws amniotic fluid Chorionic Villus Sampling (CVS) H. Conception Once egg is permeated by sperm – cell wall hardens Fertilized egg is called a zygote I. Prenatal Development Prenatal Period: (280 days from last period, 9 months, or 40 weeks) Period of the Ovum (Germinal) – first two weeks Period of the Embryo – end of the 2 nd week till the 8 th week Period of the Fetus – end of 8
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Unformatted text preview: th week till birth 1. Period of the Ovum First two weeks o Cell division o Blastocyst o Implantation 2. Period of the Embryo End of the 2 nd week till the 8 th week o Endoderm – digestive system. Lungs, internal organs form o Mesoderm – muscular, skeletal, and circulatory system are formed o Ectoderm – hair nails and teeth form o Most likely time period for miscarriage Pregnancy Support Structures- Occurs during the Period of Embryo o Amniotic sac o Placenta o Umbilical cord o 20-25% of pregnancies miscarry (spontaneous abortion)...
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