SCMC Fetal Circulation Superior Parallel circulation Ductus arteriosus (combined output) Ductus venosus shunts blood from the uv to the Foramen IC bypassing the liver ovale Foramen Ovale shunts blood from the ra to the la Ductus venosus Ductus arteriosus shunts blood from the pa to the descending aorta bypassing the lungs Blood from the lv perfuses the heart brain with well oxygenated bloodFetal Circulation – Parallel circulation (combined output) – Ductus Venosus shunts blood from the UV to the IVC bypassing the liver – Foramen Ovale shunts blood from the RA to the LA – Ductus Arteriosus shunts blood from the PA to the descending aorta bypassing the lungs – Blood from the LV perfuses the heart & brain with well oxygenated blood 50% 2/3