When most of us first hear the term "digestive system", we probably think about the area around the belly button. You know, that area, in the middle, where stuff happens, that many of us just call the stomach. In reality, it's mostly intestines. And a great deal of the digestive magic does happen here. Others of us will also consider the stomach organ itself. Especially if we have experienced symptoms like heartburn or nausea when food hits the stomach, we are acutely aware of that digestive organ. Even fewer of us will think of the mouth, as the first part of the digestive system.
Blake Myers, ND, writes about a much forgotten phase of digestion, the cephalic phase.