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Updated: June 5, 2025
This ganglion cannot do much, if any, thinking; it is rather a steering organ to control the muscles and guide the animal. It is the servant of the locomotive system. Yet it is the beginning of the brain of higher animals, and probably still persists as an infinitesimal portion of our human brain. And all this is the prophecy of a head soon to be developed.
At 39° some of the ganglion cells which have been preserved rapidly lose their colorability and then their structure breaks up, but a certain number of the others form numerous outgrowths extremely varied in appearance.
The scene is a long, handsome room or gallery, with a singular piece of furniture in the shape of an L occupying the middle. This is the switchboard, in which the wires from the offices and homes of the subscribers are concentrated like the nerves in a ganglion. It is known as the "multiple switchboard," an American invention, and is divided into sections, over which the operators preside.
Once this deliberate organization of a central ganglion of interpretation and presentation began, the development of the brain and nervous system in the social body would proceed apace. Each step made would enable the next step to be wider and bolder.
Perhaps it is not too much to say that the eidoscopic eye first awakened the slumbering animal mind, for its reflex effect upon the supra-oesophageal ganglion cannot be over-estimated. The animal will very soon begin to think. Between the turbellarian and the annelid many aberrant lines diverged.
A similar network of fibers is situated lower down in the pelvis, from which branches are distributed to the pelvic organs. At the coccyx the two chains unite into a single ganglion.
On the whole Osborne's verdict would seem just: The Neo-Lamarckian theory fails to explain heredity, Weismann's theory does not explain evolution. But, if the effects of use and disuse are transmitted, correlation of variation is to be expected. Muscle, nerve, and ganglion all vary in correlation because they are all used together and in like degree.
And the teeth are the instruments of our sensual will. The growth of the teeth is controlled entirely from the two great sensual centers below the diaphragm. But almost entirely from the one center, the voluntary center. The growth and the life of the teeth depend almost entirely on the lumbar ganglion. During the growth of the teeth the sympathetic mode is held in abeyance.
But there are also nerve-fibrils connecting the different ganglion cells, so that they may act in unison. In the higher animals we shall find these central or ganglion cells condensed in one or a few masses or ganglia. But here they are scattered over the whole surface of the elastic supporting membrane.
Their psychic and their physical dynamic is the same in the solar plexus and lumbar ganglion as in the two nuclei of the egg-cell. The first great division in the egg remains always the same, the unchanging great division in the psychic and the physical structure; the unchanging great division in knowledge and function.
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