在尸体解剖中发现一例主动脉弓发出四个分支 ,这与常态主动脉弓发出三个分支有异。我们将这四个分支按从右至左的顺序分称第一～四支 ,追踪解剖发现 :第一支发出后行至右侧胸锁关节后方分为左侧颈总动脉及右侧锁骨下动脉 ,故此支为头臂干。第二支发出后在左侧上升至颈部 ,在胸 In the autopsy, one case of aortic arch was found to have four branches, which is different from the three branches of the normal aortic arch. We will be the four branches from right to left in the order of the first four points, tracking anatomical findings: the first issued after the line to the right of the sternoclavicular joint is divided into the left common carotid artery and right under the subclavian Artery, so the support for the first arm dry. After the second issue on the left rose to the neck, in the chest