The circulatory system: dissections of the male reproductive system and pelvic bone, with the arteries and veins indicated in red and blue. Coloured lithograph by J. Maclise, 1841/1844.

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Credit: The circulatory system: dissections of the male reproductive system and pelvic bone, with the arteries and veins indicated in red and blue. Coloured lithograph by J. Maclise, 1841/1844. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)