By Hans Wecht. This is a decorative skull with a lovely frame. At the bottom of the image is the text “Mundanae foelicitatis glia”, which is Latin. It translates as “Worldly happiness glia”. Glia refers to the cells in the nervous system.
Image is from the Wellcome Collection and Wikimedia Commons, under Creative Commons Attribution 4.0 International License (CC BY 4.0). Information is from Wikipedia(CC BY-SA 3.0).