2) VI. Of the Course by Which the Blood Is Carried from the Vena Cava into the
Arteries, or from the Right into the Left Ventricle of the Heart. Harvey,
William. 1909-14. On the Motion of the Heart and Blood in Animals. The
Harvard Classics ...in the great artery or aorta. So that in the dissection of the embryo, as it were, two aortas, or two roots of the great artery, appear springing from the heart....