Lecture III
What is important here is that while the nerve-sense system is located primarily in the head, it nevertheless extends over the entire remaining organism as such. We may thus say that when we speak here with an anthroposophical purpose about the nerve-sense system, it is the system of functions in the human organism (for we are concerned here not with spatial limitations but functional limitations) that is located essentially in the head; nevertheless the head activity extends over the entire human being so that in a certain sense the whole human being is head. The same is true for the other systems. It was thus mere foolishness when a superficial professor of medicine, who did not intend really to study these matters but only wished to discredit them to the world, spoke about the “belly-system” in order to ridicule what is actually referred to by the metabolic system. He has merely shown his total lack of understanding for how the threefold constitution of the human being is functional, and not defined by spatial limitations.