See pictures of a developing blood clot and the leg veins .

Exercise helps the leg veins work against gravity to return blood to the heart.

She inserted a needle into the animals' leg vein and drew the blood.

The needle, in coming out of the monkey, had cut the monkey's leg vein.

The leg vein is quite often used for heart bypasses.

They also made four grafts from the leg vein.

This takes the pressure off your leg veins, allowing normal blood flow.

He closed the open end of the vessel, left it in place, and used leg veins instead.

It most commonly affects leg veins, such as the femoral vein.

More than 85 percent of people with the condition have at least one parent with swollen leg veins.