part_of part of part of thoracic segment of trunk heart trunk systemic artery ductus arteriosus http://upload.wikimedia.org/wikipedia/commons/e/ee/Gray502.png VHOG:0000923 MA:0001947 EHDAA:6462 MESH:D004373 UMLS:C0013273 EMAPA:17858 arterial canal Wikipedia:Ductus_arteriosus ductus layton FMA:79871 ductus botalli EFO:0002515 ductus arteriosum NCIT:C52854 galen:DuctusArteriosus SCTID:253684002 EHDAA2:0000420 A fetal blood vessel connecting the pulmonary artery with the descending aorta[MESH]. In the developing fetus, the ductus arteriosus is a shunt connecting the pulmonary artery to the aortic arch. It allows most of the blood from the right ventricle to bypass the fetus' fluid-filled lungs, protecting the lungs from being overworked and allowing the left ventricle to strengthen. There are two other fetal shunts, the ductus venosus and the foramen ovale[MP]. the fetal vessel that connects the left pulmonary artery with the descending aorta; the ductus arteriosus normally regresses into a fibrous cord, the ligamentum arteriousum after birth[MP]. The temporary channel or blood vessel between the aorta and pulmonary artery in the fetus. [TFD][VHOG] arterial duct ductus arteriosis UBERON:0005440 fetal ductus arteriosus ductus Botallo On the other hand, in the sister clade of the actinopterygians, the sarcopterygians, the gill circulation is supplemented with lung ventilation. As a result, the pulmonary artery and vein and a functional ductus arteriosus arose as a major evolutionary innovation from the sixth arch, giving the organism a flexible shunt to balance blood supply to and from gills and lungs according to environmental conditions.[well established][VHOG] Botallo's duct coronary vessel foetal structure