Drawing from life by French army surgeon Jean Baptiste Francois Leveille (1769-1829) from the 1845 book "Avec un Atlas de 24 planches dessinées d'apres nature et lithographiees par M. Leveille", published in Paris and used as reference by artists.
http://www.etsy.com/listing/68127649/1845-antique-male-anatomy-color