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NERVOUS SYSTEM
Even an animal consisting of just one cell has irritability and contractility. These terms mean that it can receive sensations and move in response to them. As the human body develops, the different parts, as you know, take on special functions. Therefore, some of the cells of the outer layer, instead of remaining to form skin, change and become the nervous system. This receives the sensations and governs the actions of the rest of the tissues of the body. It begins to work early in life for the embryo at eight weeks of age has a large head and in it is considerable brain.
There is no doubt in the minds of us Lords of Creation that this elaborate specialized system has given us the jump on the so-called lower animals. We have intelligence, memory, affection, will power, developed in many of us to a point never reached by animals and allowing us to triumph over them despite their strength, speed, and some highly developed senses. They far exceed us in these latter attributes, but all in vain when we really decide to overcome them.
The nerve cells bear no resemblance to any other cells making up the skin. Each consists of a body, and root-like threads coming off from the side, called “nerve fibers.” These fibers may grow to enormous lengths. The cells hitch up tandem fashion, or to vary the metaphor, by holding hands when one of their fibers meets up with another fiber. Nerve impulses travel along them as electricity travels along telegraph wires. Thus they carry messages from the brain to the farthest parts of the body, or bring impulses back in the opposite direction. But the traffic is always one way; out by one chain of fibers and back by another.
The place where two fibers meet is called a synapse, which is Greek for clasping, and the transfer of impulses here is a chemical reaction with a substance called acetylcholine.
Each nerve fiber is insulated by material named the sheath of Schwann, an alliterative aid to medical students. As the fibers traverse the body, they are gathered in bundles with strong connective tissue and blood vessels. Now we have something like a telegraph cable. That is what we call a nerve. The biggest one of the body, the sciatic, may be half an inch across. Nerves are exceedingly mm and tough, a great help to the surgeon as those of any fair size may be seen, felt, and handled easily.
Yet despite this solidity, and the miles of nerves which the body presumably contains, I suspect that most of you have never seen or felt one of these tough cords. The nervous system is the dominating factor in our bodies, and being so important it is, not exposed to the vulgar gaze or even placed where it can be handled. On the inside of your elbow there is a groove between two bones. This spot is popularly called the funny bone and many of you have hit it just right and experienced an intensely unpleasant sensation. You have come in contact with the only good-sized nerve I can think of which is close to the surface of the body. This is the ulnar. If you hit it again and can maintain your equanimity, notice how you feel the tingle in your little and ring fingers.
The infinitesimally fine nerve filaments penetrate to the minutest parts of the body. When the blood system is described, it is likened to a tree with its big trunk, large branches, and ever smaller branching twigs, reaching to our remotest parts. To one with blurred vision the nervous system would appear much like this. The simile which I like best, however, is that of a gauzy fabric, for everywhere there are spidery cells with wavy tendrils or the finest spun threads. Everywhere – brain, cord, or nerves – there is nothing solid but the supporting tissues. Remove these latter and though the outlines of the body would remain, they would be ghostlike, ethereal to our crude eyes.
When the nervous system is entirely formed, as we find it in the body after birth, it consists of:
1. Central nervous system
a. Brain
b. Spinal cord
2. Peripheral nervous system
(Peripheral means towards the further or outer surface: hence away from the brain)
a. Spinal nerves
b. Cranial nerves
3. Involuntary nervous system (These nerves are often spoken of as sympathetic and parasympathetic nerves. Many of you know of cases where some of these nerves were removed for such conditions as high blood pressure. This was referred to as a sympathectomy.)
4. Sense organs
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