The document explains fetal blood circulation, highlighting the role of the single umbilical vein and two umbilical arteries in transporting oxygenated and deoxygenated blood between the placenta and fetus. Key components include the flow of blood from the right atrium to the left atrium via foramen ovale, and from the right ventricle to the aorta via ductus arteriosus due to pressure differences. After birth, certain connections close and transform into anatomical structures such as ligamentum venosum and ligamentum arteriosum.

1. Presented by
Mr.Kalyan kumar
Msc (N)

2.  Single umbilical vein carry 80% of oxygenated
blood from placenta towards the fetus. while it
moving towards the heart of the fetus one branch will
give blood to the fetal liver. Then the umbilical vein
enter into the inferior Vena cava through ductus
venosus and it empty into right Atrium.

3.  From right Atrium majority of the blood will
move towards left Atrium via foramen ovale
and the remaining blood will move towards the
right ventricle through tricuspid valve.

4.  The blood in the left Atrium will move to a left
ventricle via bicuspid valve.
 During systole the blood in the left ventricle
move towards aorta and it supplies the body
parts of foetus.

5.  The blood in the right ventricle moves towards
Pulmonary artery, but in the fetal state
pulmonary system pressure is higher than the
systemic pressure, so Blood Will moves from
Pulmonary artery to aorta via ductus
arteriosus.

6.  Two umbilical artery carry deoxygenated blood
from various parts of the fetal body towards the
placenta.
 After the birth of the newborn all these
connections will close and ductus venosus
become ligamentum venosum, ductus
arteriosus become ligamentum arteriosum and
foramen ovale become fossa ovalis.

7. Summary
Conclusion