robin082006
Forum Hero
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See the picture and memorize it.
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The Key to Succeed is Patience.
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| Dr.Papez
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1st principle:
Placenta is a like lungs; Fetal pulmonary circulation is high resistance and systemic is low resistance;
One umblical vein (from placenta)Vein carry oxygenated blood (similar to pulmonary vein carrying oxygentaed blood)
and
2 umblical As. from internal iliac areteries of Fetus carry less oxygenated blood (similar to pulmonary A carrying deoxygentaed blood)back from fetus to placenta.
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| vka123
Forum Junior
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thanks for the help.It did facilitate understanding.
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| Dr.Papez
Forum Senior
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you are Welcome- let me add
2nd principle:
One ductus venosus (DV) to delievr blood to IVC of the fetus
One ductus arteriosus (DA)- to deliver blood from high pressure pulmonary (as they are collapsed and non-functioning, blood has to enter aorta only thro DA-this usually enter beyong the origin of left subclavian
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| Dr.Papez
Forum Senior
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3rd principle:
Most of the Blood from (more oxygenated blood from IVC) IVC preferntially directed to left atrium through PFO-right atrium just acts as a conduit.
Blood from SVC (less oxygenated coming form the head and neck of fetus) goes direct to right evntricle and them PA and then DA and then to aorta-which recieves now blood from IVC-LA-LV-Aorta as well... So the proxiaml aorta blood going to brain is more oxygenated than the blood in the aorta distal to DA connection-hope that is clear. So dital arota -less oxygnated blood goes via abd aorta-iliac A- umblical A- placenta- gets oxygen and then come nack thro UV- DV- IVC.
Please refer to picture in Kaplan now to see how the oxygen saturation varies with each new vessel entering the circulation.
Bye
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| Cedrick
Forum Fanatic
Topics: 320
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Thanks for the explination
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