White's Physiological Manikin, 1886
James T. White & Co.
This life-sized fold-out model of the human body was marketed for at least 20 years. The manikin's flaps correspond to lecture topics such as the circulatory system, the brain and nervous system, the skeleton and muscles, venereal disease and the physiology of reproduction (male and female), first aid, and the dangers of corseting (visible in the far right).
Another view of the same foldout from The Science Museum London.