A transmission electron micrograph showing a longitudinal section of cardiac (heart) muscle, in which the sarcomere structure and a large intercalated disc can be seen. Credit: Professor Giorgio Gabella, Wellcome Images.
A colour-enhanced transmission electron micrograph of myofibrils in an uncontracted skeletal muscle cell (muscle fibre), showing the structure of the sarcomere with its dark and light bands between the two Z-discs. Credit: University of Edinburgh, Wellcome Images.
it is likely that this chart is either copied from, or based on, an earlier Chinese exemplar that may now be lost. The Chart, which is undated, is now kept in the library of Tenri University in Japan. It is reproduced here from the book by Katō Chie 加藤千恵, Furō fushi no shintai: Dōkyō to “tai” no shisō 不老不死の身体 — 道教と「胎」の思想 (The Ageless and Deathless Body: Taoism and the Idea of the “Embryo”; Tokyo: Taishūkan shoten, 2002), p. 121.
Here's the Wellcome Image used for the cover of the latest Big Picture. The artist is Bill McConkey. This image shows an individual who has removed their layer of skin leaving the muscle layer showing. This individual is ironing their skin in an attempt to remove wrinkles. Fine lines and wrinkles are an inevitable part of the aging process. www.wellcome.ac.uk/bigpicture/proteins