"Verdauung" (https://kmed.uni-giessen.de/ilias/goto.php?target=pg_44998_167119) . The file "Verdauungsapparate des Menschen” from Wikipedia https://de.wikipedia.org/wiki/Verdauung#/media/Datei:Digestive_system_diagram_de.svg) was adapted (language and descprtion lines chanced) by Prof. Vorwerk (https://www.youtube.com/channel/UCpBHT7vSwpHdOQdVJ2IYdGA) can be reused under the the same conditions like the original file.