a. Ductus arteriosus
b. Ductus venosus
c. Ductus utriculosaccularis
d. Ductus reuniens
-The ductus arteriosus represents the distal portion of the sixth left aortic arch and connects the left pulmonary artery to the beginning of the descending aorta.
-During fetal life, blood passes through it from the pulmonary artery to the aorta, thus bypassing the lungs. After birth, it normally constricts, later closes, and becomes the ligamentum arteriosum.
-A persistent patent ductus arteriosus results in high-pressure aortic blood passing into the pulmonary artery, which raises the pressure in the pulmonary circulation.
-A patent ductus arteriosus is life threatening and should be ligated and divided surgically.
Reference: BDC 4th ed., vol.1, page-261
Clinical Anatomy-Snell, 8th ed., page-126