Ligamentum arteriosus

The ligamentum arteriosum (Latin: arterial ligament) is a small ligament that is the remnant of the ductus arteriosus formed within three weeks after birth. Structure At the superior end, the ligamentum attaches to the aorta—at the final part of the aortic arch (the isthmus of aorta) or the first part of the descending aorta. [Source: Wikipedia ]