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The upper centers, cardiac plexus and cervical plexuses, thoracic ganglion and cervical ganglia now assume positivity. These, the upper polarized centers, have now the positive rôle to play, the solar and the hypogastric plexuses, the lumbar and the sacral ganglia, these have the submissive, negative rôle for the time being. And what then?
These possess neither brain nor spinal cord; their nerve-centres, instead of being concentrated in a cranium and vertebral canal, are entirely disseminated through the cavities of the trunk, as are the visceral plexuses in vertebrated animals.
A tumour composed of newly formed nerve tissue is spoken of as a #true neuroma#; when ganglionic cells are present in addition to nerve fibres, the name ganglionic neuroma is applied. These tumours are rare, and are chiefly met with in the main cords or abdominal plexuses of the sympathetic system of children or young adults.
The Sympathetic Nervous System consists of a double chain of Ganglia on the side of the Spinal column, and scattered ganglia in the head, neck, chest and abdomen. From these ganglia numerous fibers branch out to the organs of the body, blood vessels, etc. At various points, the nerves meet together and form what are known as plexuses.
The cervical plexuses and the cervical ganglia, which should only begin to awake after adolescence, these centers of the higher dynamic sympathy and cognition, are both artificially stimulated, by the adult personal love-emotion and love-will into response, in a quite young child, sometimes even in an infant. This is a holy obscenity.
The only thing is to sit among the roots and nestle against its strong trunk, and not bother. That's how I write all about these planes and plexuses, between the toes of a tree, forgetting myself against the great ankle of the trunk.
And Robinson believes that this is the explanation of the many pathologic manifestations of every viscus at the menopause; that is, "the irritation which arises by trying to pass more nervous impulses over plexuses than normal gives origin to what is unfortunately known as functional disease. It is just as organic as any disease, only we are unable to detect it."
And in the man, the voice breaks, the beard begins to grow round the lips and on to the throat. There are the obvious physiological changes resulting from the gradual bursting into free activity of the hypogastric plexus and the sacral ganglion, in the lower body, and of the cervical plexuses and ganglia of the neck, in the upper body.
The nerves branch off from their centers the brain, the spinal cord, the ganglions, and the great plexuses and run, in general, downward and outward from the trunk lines, in a manner somewhat analogous to the branches and twigs of an inverted little tree.
4th. An impression made on one part of the sympathetic system is easily communicated to another, and to the ganglionic masses of the visceral plexuses, already described. Hence the rapid effect of many emotions upon the processes of digestion; hence the epigastric response to the emotion of fear, which led Bichat to localize this feeling in the solar plexus lying behind the stomach.
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