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Arm veins. Historical illustration of the veins and muscles of the arm. The veins are coloured blue to show that they carry deoxygenated blood. At left are the upper arm and the underside of the forearm. At upper left, the large axillary vein branches into three. At right are the veins of the top side of the forearm. Colour lithograph by Fairland from The Vessels of the Human Body, 1837. Based on drawings by J. Swandale. (KEYSTONE/SCIENCE PHOTO LIBRARY/SHEILA TERRY)