Ductus

Mith, I've explored that option. There are some that believe that it is a remnant of the ductus arteriosus, but animals like opossums never have an ductus arteriosus and have the same setup for venous return...

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... walls of blood vessels and in hollow organs of digestive, respiratory, urinary and reproductive organs. ex. bladder, intestines, ureters, ductus deferns. ,bronchioles. function: Moves food, urine, and reproductive tract secretions; controls diameter of respiratory passages (bronchi); regulates ...

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i'm not too familiar with this, but wit "fetal" circulation, isn't it a little different in some mammals because there's a ductus arteriosus that connects the pulmonary artery and the aorta? i think this might be because the fetus does not yet use its lungs, so the pulmonary circuit ...

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... The neonates with PS shunts were separated into 3 types. Two patients had congenital absence of portal vein (CAPV) with PS shunt by ductus venosus Arantii. Four had extrahepatic porto-left renal venous (PRV) shunt. Nine neonates presented with intrahepatic porto-hepatic venous (PV) ...

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... They also report that patients with F1n1 mutations are prone to suffering strokes and often are born with a serious vascular anomaly called patent ductus arteriosus. Their findings are the cover story of the December Neuron. "No one realized until now that this gene played a role in the brain" ...

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