kvanm:

From the advent of photography in the 19th century and into the 20th century, medical students, often in secrecy, took photographs of themselves with the cadavers that they dissected: their first patients. The photographs were made in a variety of forms, from proud class portraits to staged dark-humor scenes, from personal documentation to images reproduced on postcards sent in the mail. Poignant, strange, disturbing, and humorous, they are all compelling.

Further reading: http://www.blastbooks.com/dissection.htm