Seen interconnections
For primitive people in prehistoric times and modern representatives of wild tribes living in a persistently isolate state, the connections of the human brain with consciousness are a mystery.
To some extent, this is true for educated people, including specialists studying the interdependence of the brain and the psyche.
Scientific evidence
Nevertheless, by now all educated people living in non-isolated communities know that in our material and ideal world such phenomena as the human brain, mind and consciousness are definitely interrelated. At the same time, there is no scientific and reliable evidence of the possibility of the existence of the psyche and consciousness without the physical presence of the brain in the organism under study. True, there is no inverse evidence. But if the psyche and the consciousness of a certain being (organism) are possible after the death of the brain, then there is no confirmation of this in the real world. Actually, this issue is engaged in thanatology - a very ambiguous area of human knowledge.
Thus, based on today's knowledge of humanity, we can conclude that the brain is the main organ of consciousness (at least in humans). It should be understood that consciousness is one of the functions of the brain (it is impossible to assert that the main function, but certainly organizing, for any person as a social being).
The brain-consciousness system
The human brain is a very complex non-isolated biological system that is formed in the process of growth and maturation of the personality in the society, including, under the influence of such a factor as the direct transfer of knowledge about life to other people and the assimilation of previously accumulated by the socium and recorded in one way or another information , transmitted from generation to generation. That is, the consciousness of a person is, first of all, a certain reflection (and who does not believe that reflection, let him read Descartes) the amount of knowledge acquired in the process of social interactions. In other words, shared knowledge.
If a child is isolated from people from childhood, the psyche will, of course, develop, but consciousness is not. This evidence is given by the various real cases of the Mowgli children: they do not have no consciousness at all, it is simply undeveloped and is a consciousness with animals (of a certain kind) that have brought them up.
In the language of analytical psychology, the collective unconscious of a particular human person is formed in the process of development and upbringing under the influence of a common collective
conclusions
Consciousness, as the highest form of personality manifestation, is possible as a result of a complex process of biosocial development. And here we can no longer talk about the brain, mind and consciousness as separate objects (or objects), but only as a kind of a transharmonic synergetic system that exists both in man and outside his physical shell, and even outside his personal energy field.