<Tr> <Th> FMA </Th> <Td> 79871 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <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> The ductus arteriosus is formed from the left 6th aortic arch during embryonic development and attaches to the final part of the aortic arch (the isthmus of aorta) and the first part of the pulmonary artery </P>

When is the ductus arteriosis normally renamed the ligamentum arteriosum