Lecture ObjectivesStudent will be able to:differentiate
assessment techniques for fetal well-being and maturity.determine
the use of the electronic fetal monitors.
Chorion Outermost membrane that develops into the placenta
Amnion innermost membrane produces amniotic fluid
Amniotic FluidCushions embryo and fetusControls tempPromotes
growth, allows movementPrevents fetal adherence to the
amnion700-1000 normalOligohydramnios less than 500 ccsHydramnios-
more than 1000 ccsPolyhydramnios more than 2000 ccs
PlacentaResponsible for nutrition, respiratory and excretory
exchange between mother and fetusTwo parts: maternal and fetal
sideUmbilical Cord 2 arteries and 1 veinWhartons jelly
FETAL CIRCULATIONThe lung and liver are nonfunctional
Ductus VenosusBlood bypasses the liver through the ductus
venosus and goes directly to the inferior vena cava.
Foramen OvaleShunts blood from right atrium to left atrium,
enables oxygen rich blood to by-pass the lungs and circulate into
the body.
Ductus ArteriosusBlood from the superior vena cava passes
through the right ventricles and pulmonary artery through the
ductus arteriosus into the descending aorta on its way to get
oxygenated in the placenta.
Fetal Circulation (continued)
****************Blood rich in oxygen and nutrients enters the
fetus thru the umbilical vein. Approx. of bld goes to liver , and
the rest bypasses the liver and enters the inferior vena cava thru
the first shunt, the ductus venosus.From the inf vena cava, to
right atrium, most of bld goes directly into left atrium thru the
foramen ovale, the second shunt, where it mixes with blod returning
from the lungs. Blood is pumped into left ventricle and then into
aorta to nourish fetus*
