1. During the first 20 days of the embryonic stage, the first germ layers have formed.

2. It is from these that the rest of the and form.

3. From a single fertilized egg of about 0.14 millimeters in diameter, to an adult human being, the neurophysiology of development of the brain and nervous system is nothing short of remarkable. We are born with around 100 billion and the development of the brain continues long after , with some neurons in the neocortex continuing to grow well into .

4. Because the germ layers can into a vast variety of organs and tissues, they are of particular interest in the study of human development and cell research.

5.There are many intricate and co-dependent going on during the course of growth and of a human being. 

6. The individual and collective processes can be so easily and consequently, become imbalanced at any TIME that it is truly miraculous that many of us to functional adulthood at all.

7. The system and the skin develop from the ectoderm layer. 

8. This common origin is reflected in a group of disorders, the neurocutaneous syndromes, in which skin signs with signs of brain disease.

9. Examples of neurocutaneous syndromes are neurofibromatosis, tuberous sclerosis, and the SturgeWeber syndrome, all of which may be associated with seizures, developmental delay, learning and problems.

Microbes are not the primary originator of a disease, rather they are biological, meaningful helpers and part of a complex disease process. Viruses, bacteria, and fungi are organized by the germ layer and brain relay and are active in the regeneration phase.