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37 Cards in this Set
- Front
- Back
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red line=chorionic membrane
orange line=amniotic membrane in between red & orange lines=chorionic cavity blue=embryo yellow=yolk sac purple=connecting stalk pink=chorionic villi |
red line?
orange line? in between red & orange lines? blue? yellow? purple? pink? |
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when does fetal period begin
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begining of 9th week
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conceptus
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everything derived from the embryo including fetus (or embryo) plus all surrounding membranes
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importance of yolk sac
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early nutrient transfer, earliest site of blood cell development, formation of germinal cells
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importance of allantois
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(blind ended sac lined by endoderm) induction of umbilical vessels (aa & vv)
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amniotic sac and membrane
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protects from injury, symetrical growth, regulates fetal temp, fluid exchange
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oligo hydramois
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inadequate fluid levels
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What is Chorion
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Space between amnion and uterus
Filled with fluid early in life Later, as the amnion grows, chorionic space dissappears. Villous chorion eventually becomes placenta |
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chorion dissapears by what period
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fetal period
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describe placenta
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chorionic villi increase surface area. CV is rich w/ blood vessels to collect nutrients from mothers blood
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syncitiotrophoblast
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embryonic tissue
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endometrium
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side closest to mom
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viability of premature birth
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>500 g, can survive but may or may not thrive
<500 g, usually won’t survive. |
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Estimated day of fertility
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(=LNMP - 2 wks)
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trimesters are approx _____ weeks
1)first trimester 2) second trimester 3)third trimester |
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1) most critical 2)starts previable ends viable 3)all viable |
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quickening
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first fetal movements felt (17-20 weeks)
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lung maturity assessed by _________
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amniocentesis surfactant levels
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dizygotic twins
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fraternal - 2 seperate fertilization events; seperate amniotic membranes
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monozygoti twins
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identical - 1 zygote or blastocyst diveds into 2 embryos and often in same cavity
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methods of examining fetus in utero (5)
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1) ultrasound
2)amniocentisis 3) chorionic villus sampling (CVS) 4)fetoscopy 5) radiology |
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ultrasound
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high frequency sound. generally safe
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aniocentesis
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needle aspiration of amniotic fluid 1/2% rate of spontaneus abortion (can be done as early as 10 weeks; safest 12-18 weeks
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chorionic villus sampling (CVS)
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clip a few placental vili best done 10-12 weeks. can clip off fingers accidentily
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fetoscopy
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fiber optics, limited use
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radiology
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xray - hazerdous to fetus
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before ___ week injury to the fetus usually results in death
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2nd week
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developmental defects resulting from external agents act by
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Interfering with cell division
Interfering with cell migration Delaying cell differentiation |
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cleft
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failure of fusion
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agenisis
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failure of induction of an organ to develop at all
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ectopy
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abnormal location of development
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duplication
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2 sx forming where only 1 should
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red line=chorionic membrane
orange line=amniotic membrane in between red & orange lines=chorionic cavity blue=embryo yellow=yolk sac purple=connecting stalk pink=chorionic villi |
red line?
orange line? in between red & orange lines? blue? yellow? purple? pink? |
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duplication
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2 sxs form where only 1 should
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stenosis
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abnormal narrowing
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fistula
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abnormal connection
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cyst
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abnormal fluid containing sx
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atresia
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blind tube
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