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Primary arrangement of longitudinal stems and series of six aortic bows

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(A) unpaired dorsal aorta; (DA) dorsal aorta; (I-VI) aortic bows, of which V is rudimentary; (TA) truncus arteriosus; (VA) ventral aorta. (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.)