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We encountered two cases of abnormal origins of branches arising from the arch of the aorta. That is to say, in the first case, the aortic arch gave directly off the left external carotid artery as its second branch and the left internal carotid artery as its third branch. In the second case, the aortic arch gave directly off the left external carotid artery as its second branch and the left brachiocephalic trunk dividing into the left internal carotid and the left subclavian artery as its last branch. In both cases the right brachiocephalic trunk arose normally as the first branch of the aortic arch. In the first case the left subclavian artery was the last branch of the aortic arch. It is conjectured that those anomalies were caused by the disappearance of the left third aortic arch and the persistence of the left carotid duct during the embryonic period.

Two Cases of Abnormal Origins of the Left External and Internal Carotid Arteries in the Japanese Monkey