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37 Cards in this Set

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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?
when does fetal period begin
begining of 9th week
conceptus
everything derived from the embryo including fetus (or embryo) plus all surrounding membranes
importance of yolk sac
early nutrient transfer, earliest site of blood cell development, formation of germinal cells
importance of allantois
(blind ended sac lined by endoderm) induction of umbilical vessels (aa & vv)
amniotic sac and membrane
protects from injury, symetrical growth, regulates fetal temp, fluid exchange
oligo hydramois
inadequate fluid levels
What is Chorion
Space between amnion and uterus
Filled with fluid early in life
Later, as the amnion grows, chorionic space dissappears.
Villous chorion eventually becomes placenta
chorion dissapears by what period
fetal period
describe placenta
chorionic villi increase surface area. CV is rich w/ blood vessels to collect nutrients from mothers blood
syncitiotrophoblast
embryonic tissue
endometrium
side closest to mom
viability of premature birth
>500 g, can survive but may or may not thrive
<500 g, usually won’t survive.
Estimated day of fertility
(=LNMP - 2 wks)
trimesters are approx _____ weeks
1)first trimester
2) second trimester
3)third trimester
13
1) most critical
2)starts previable ends viable
3)all viable
quickening
first fetal movements felt (17-20 weeks)
lung maturity assessed by _________
amniocentesis surfactant levels
dizygotic twins
fraternal - 2 seperate fertilization events; seperate amniotic membranes
monozygoti twins
identical - 1 zygote or blastocyst diveds into 2 embryos and often in same cavity
methods of examining fetus in utero (5)
1) ultrasound
2)amniocentisis
3) chorionic villus sampling (CVS)
4)fetoscopy
5) radiology
ultrasound
high frequency sound. generally safe
aniocentesis
needle aspiration of amniotic fluid 1/2% rate of spontaneus abortion (can be done as early as 10 weeks; safest 12-18 weeks
chorionic villus sampling (CVS)
clip a few placental vili best done 10-12 weeks. can clip off fingers accidentily
fetoscopy
fiber optics, limited use
radiology
xray - hazerdous to fetus
before ___ week injury to the fetus usually results in death
2nd week
developmental defects resulting from external agents act by
Interfering with cell division
Interfering with cell migration
Delaying cell differentiation
cleft
failure of fusion
agenisis
failure of induction of an organ to develop at all
ectopy
abnormal location of development
duplication
2 sx forming where only 1 should
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?
duplication
2 sxs form where only 1 should
stenosis
abnormal narrowing
fistula
abnormal connection
cyst
abnormal fluid containing sx
atresia
blind tube