Foramen ovale and inferior vena cavae

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SUMMARY

In fetal circulation, blood from the inferior vena cava predominantly flows to the left atrium via the foramen ovale, unlike blood from the superior vena cava. This difference is attributed to the higher pressure of the inferior vena cava blood, which includes arterial blood from the umbilical artery. The foramen ovale acts as a right-left shunt, allowing most blood to bypass the pulmonary system, which is non-functional before birth. Understanding this mechanism is crucial for comprehending fetal cardiovascular physiology.

PREREQUISITES
  • Fetal circulation dynamics
  • Anatomy of the heart, specifically the foramen ovale
  • Understanding of blood pressure differences in fetal blood flow
  • Knowledge of umbilical artery function
NEXT STEPS
  • Research the anatomy and function of the foramen ovale in detail
  • Study the physiological differences between fetal and adult circulation
  • Explore the implications of right-left shunts in congenital heart defects
  • Learn about the role of the umbilical artery in fetal blood circulation
USEFUL FOR

Medical students, cardiologists, obstetricians, and anyone interested in fetal cardiovascular physiology will benefit from this discussion.

sameeralord
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Hello everyone,

In fetal circulation most blood from inferior vena cavae go to left atrium via foramen ovale. This is not the case for superior vena cavae. But both drain into right atrium, so how is their a difference? Thanks :smile:
 
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sameeralord said:
Hello everyone,

In fetal circulation most blood from inferior vena cavae go to left atrium via foramen ovale. This is not the case for superior vena cavae. But both drain into right atrium, so how is their a difference? Thanks :smile:

It has to do with the angle and pressure of the entering blood. Blood from the inferior vena cava is under greater pressure because it also contains the arterial blood of the umbilical artery. Where it enters the RA it is poised to open the "flap" made by the foramen ovale.

The point of this right-left shunt is to by pass the majority of the circulation to the pulmonary system which, prior to birth, doesn't need circulation.
 
bobze said:
It has to do with the angle and pressure of the entering blood. Blood from the inferior vena cava is under greater pressure because it also contains the arterial blood of the umbilical artery. Where it enters the RA it is poised to open the "flap" made by the foramen ovale.

The point of this right-left shunt is to by pass the majority of the circulation to the pulmonary system which, prior to birth, doesn't need circulation.

Good stuff. Thanks :smile:
 

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