Double aorta occurs due to -

Ans. is 'd' i.e.. Persistence of distal portion of the right dorsal aorta o During 8th week of infra uterine life, the final fetal arterial arrangement is achieved.AORTIC ARCHFateIMaxillary arteryIIHyoid and stapedial arteriesIIICarotid arteriesIVLeft - Arch of aortaRight - Proximal part of right subclavianVDegeneratesVILeft - Proximal part forms left pulmonary artery and distal part persists as ductus arteriosusRight - Right pulmonary arteryVII intersegmentary arteryRight - Distal part of right subclavianLeft - Left subclaviano With a double aortic arch, the right dorsal aorta persists between the origin of the seventh intersegmentary artery and its junction with the left dorsal aorta. A vascular ring surrounds the trachea and esophagus and compresses these structures.