The close relationship between structure and function is first pointed out. At the same time, however, the difference between changes of structure and of function is stressed: the former is strictly localised, the latter is characterised by chain reactions affecting the entire motor system (holistic). The decisive factor from the developmental point of view is the program which enables the organism to survive. It is this program which is encoded by heredity, and makes adequate functioning possible in the first place. Structure adapts itself only gradually, but then enhances and also lim its function. If necessary, however, structure readapts itself to a change in function (program).

        Key words: function, structure, functional pathology, chain reaction, program