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胎儿双主动脉弓病理所见（Autopsy findings of double aortic arch ，DAA）
升主动脉呈“Y”形分为左、右主动脉弓，左、右弓跨越左、右主支气管后，分别发出左、右侧颈总动脉和锁骨下动脉，并最终于食管后方汇入降主动脉，形成完整的血管环。
The ascending aorta bifurcates directly at the level of the trachea with arches to the right and to the left in a letter “Y” configuration, with both arches passing over the respective bronchi and subsequently joining posterior to the esophagus and fusing into the descending thoracic aorta which had a left-sided course anterior to the spine, an anatomically complete vascular ring formed and each aortic arch gives off the subclavian artery and the common carotid independently.
来源于：心驰声往
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