Definition for Ductus arteriosus
From Biology Forums Dictionary
In the developing fetus, the ductus arteriosus (DA), also called the ductus Botalli, is a blood vessel connecting the pulmonary artery to the aortic arch. 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.