Foetal/Fetal circulation 5

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Fetal Circulation

 1. Oxygenated blood from placenta through umbilical vein enters the liver.

 It supplies 2/3 of liver

 • and then join portal sinus ( a Branch of Portal vein) ,it supplies 1/3rd of liver

 • to form Ductus Venosus

 2. Ductus Venosus runs undersurface the liver to join inferior vena cava at its junction of hepatic veins.

 3. Majority of the thoracic 'IVC' blood passes through foramen ovale

 • And reaches left atrium (LA) and joins blood coming from pulmonary veins

 • And passes to the left ventricle

 4. Blood from LV pumped into vessel of hand and fore limbs and small amounts to ascending aorta.

 5. Right atrium (RA) receives blood

 • Mainly from superior vena cava (SVC) and Small amount from thoracic IVC

 • And pumped into pulmonary artery.

 6. Main bulk of Blood (80% of RV output ) in the pulmonary artery , passes through Ductus Arteriosus to descending aorta (thus bypassing the lungs)

 • Descending aorta also receive blood pumped by LV .

 • Less blood (20% of RV output ) is pumped through the lungs.

 7. Descending aorta supplies to the body and finaly blood returns to the placenta via the two umbilical arteries .

 • In placenta, deoxygenated blood become oxygenated.


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