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Variant origin of the right subclavian artery from descending aorta

This diagram shows the variant origin of the right subclavian artery from the descending aorta, distal to the left subclavian artery origin. The right subclavian artery passes to the right behind the trachea and esophagus. In some cases, the right vertebral artery may arise from the anomalous right subclavian artery, or it may arise directly from the aorta. Such differences influence the type of steal that may arise in subclavian artery stenosis with anomalous origins of these vessels. (Contributed by Dr. Douglas Lanska. Source: Dwight T, McMurrich JP, Hamann CA, Piersol GA, White JW, Heisler JC. Human Anatomy: Including Structure and Development and Practical Considerations. Vol. 1. Philadelphia and London: J.B. Lippincott Co., 1907.)