https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8782538
Myologic plate of Crisóstomo Martínez. Three upright muscle-manikins, representing views from different sides, with bones sketched in and musculatures fully crosshatched; at right is an outline representation of a child's skeleton; figures are surrounded by proportional circles and lines. Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use