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In the vascular system we have a number of useless cords which represent relics of atrophied vessels that were once active as blood-canals the ductus Botalli between the pulmonary artery and the aorta, the ductus venosus Arantii between the portal vein and the vena cava, and many others. The many rudimentary organs in the urinary and sexual apparatus are particularly interesting.
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