https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13953794
Cross-section of skull in profile view, showing the intercranial nerves and vessels. Etching by Wenceslaus Hollar after Leonardo da Vinci, 1651.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use