An écorché head of a man: three-quarter view, showing the right-hand side of the head dissected, and the left-hand side undissected. Watercolour by J. C. Zeller, 1833.

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An écorché head of a man: three-quarter view, showing the right-hand side of the head dissected, and the left-hand side undissected. Watercolour by J. C. Zeller, 1833. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.