This website of public domain anatomical images from human history was put together by the U.S. National Institute of Health. From their site:

"Historical Anatomies on the Web is a digital project designed to give Internet users access to high quality images from important anatomical atlases in the Library's collection. The project offers selected images from NLM's atlas collection, not the entire books, with an emphasis on images and not texts. Atlases and images are selected primarily for their historical and artistic significance, with priority placed upon the earliest and/or the best edition of a work in NLM's possession."