Location and Anatomy. The portal vein is formed by the merging of the splenic vein, which brings blood from the spleen, and the superior mesenteric vein, ...

Abnormalities in the ventricular venous anatomy may occur in congenitally corrected transposition of the great arteries. The findings of a recent retrospective study suggest that this ...

Other differences exist in the anatomy of arteries and veins due to their different functions. Veins have thinner walls. They also have valves to prevent the backward flow of blood.

What Can Go Wrong. Sometimes one or more hepatic veins can narrow or get blocked, so blood can’t flow back to your heart. The cause is often a blood clot or growth.. Other things that can block ...

Venous insufficiency is a condition in which the flow of blood through the veins is blocked, causing blood to pool in the legs. It's often caused by blood clots. We’ll describe the causes of ...