The Ectoderm is the outer cotyledon, i.e. squamous epithelium, e.g. the outer skin with eczema, etc. All special programs from this cotyledon have their Hamer’ Focus in the cerebral cortex. We can also say that the cerebral cortex controls the Ektoderm. In Germanische Heilkunde the Ektoderm has the color red in the scientific diagnosis chart.