<P> In the developing fetus , the ductus arteriosus , also called the ductus Botalli , is a blood vessel connecting the main 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 . Upon closure at birth , it becomes the ligamentum arteriosum . There are two other fetal shunts , the ductus venosus and the foramen ovale . </P>
<P> In the developing fetus , the ductus arteriosus , also called the ductus Botalli , is a blood vessel connecting the main 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 . Upon closure at birth , it becomes the ligamentum arteriosum . There are two other fetal shunts , the ductus venosus and the foramen ovale . </P>
in the fetus the ductus arteriosus carries blood from
in the fetus the ductus arteriosus carries blood from
the main pulmonary artery to the proximal descending aorta
the main pulmonary artery to the proximal descending aorta