It is the ganglionic system that carries on the circulation
of the blood, the action of the capillaries, lymphatics, arteries, and
veins, together with the work of secretion, absorption, and most of the
internal working of the body, which goes forward without any knowledge
or control of the mind.
Every portion of the body has nerves of sensation coming from the
spine, and also branches of the sympathetic or ganglionic system. The
object of this is to form a sympathetic communication between the
several parts of the body, and also to enable the mind to receive,
through the brain, some general knowledge of the state of the whole
system. It is owing to this that, when one portion of the body is
affected, other portions sympathize. For example, if one part of the
body is diseased, the stomach may so sympathize as to lose all appetite
until the disease is removed.
All the operations of the nervous system are performed by the influence
of the nervous fluid, which is generated in the gray portions of the
brain and ganglia. Whenever a nerve is cut off from its connection
with these nervous centres, its power is gone, and the part to which
it ministered becomes lifeless and incapable of motion.
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