https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13992477
Four écorché figures, showing the deep muscles of the axial skeleton (torso), hands and feet. Crayon manner print by J. Gamelin, 1778/1779.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use