This is a body slice of the upper arm of a male. In the center of this slice is the humerus bone. It is surrounded by layers of muscle, then skin. Colored wax has been used as a stain to highlight the different components. These body slices served as teaching tools for medical students in the 1930s and 1940s. They were provided by the Loyola University School of Medicine and the University of Illinois Department of Anatomy, and were refurbished by Michael Reese Hospital and Medical Center. The man and woman died of natural causes. Their bodies were frozen, cut into sections, and then preserved in glass containers filled with a formaldehyde solution.