Ductus arteriosus

The ductus arteriosus, also called the ductus Botalli, named after the Italian physiologist Leonardo Bottallo[1], is a blood vessel in the developing fetus connecting the trunk of the pulmonary artery to the proximal descending aorta. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. [Source: Wikipedia ]