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This system has its center in the brain, while the other has its center in the ganglionic mass at the back of the stomach known as the solar plexus, and sometimes spoken of as the abdominal brain.

The cerebro-spinal system is the channel of our volitional or conscious mental action, and the sympathetic system is the channel of that mental action which unconsciously supports the vital functions of the body. Thus the cerebro-spinal system is the organ of the conscious mind and the sympathetic is that of the subconscious mind. But the interaction of conscious and sub-conscious minds requires a similar interaction between the corresponding systems of nerves, and one conspicuous connection by which this is provided is the "vagus" nerve.

This nerve passes out of the cerebral region as a portion of the voluntary system, and through it we control the vocal organs; then it passes onward to the thorax, sending out branches to the heart and lungs; and finally, passing through the diaphragm, it loses the outer coating which distinguishes the nerves of the voluntary system and becomes identified with those of the sympathetic system, so forming a connecting link between the two and making the man physically a single entity.

Similarly different areas of the brain indicate their connection with the objective and subjective activities of the mind respectively, and, speaking in a general way, we may assign the frontal portion of the brain to the former, and the posterior portion to the latter, while the intermediate portion partakes of the character of both.

The intuitional faculty has its correspondence in the upper area of the brain, situated between the frontal and the posterior portions, and, physiologically speaking, it is here that intuitive ideas find entrance.

These, at first, are more or less unformed and generalized in character, but are, nevertheless, perceived by the conscious mind; otherwise, we should not be aware of them at all. Then the effort of Nature is to bring these ideas into more definite and usable shape, so the conscious mind lays hold on them and induces a corresponding vibratory current in the voluntary system of nerves, and this in turn induces a similar current in the involuntary system, thus handing the idea over to the subjective mind.