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BRAIN: AREAS OF BRAIN AND THEIR DUTIES
Neurologists really do know a great deal about the different areas of the brain and what goes on at these places. We call this localization and it is of great help, particularly in the surgery of the brain. But, a century or so ago, the phrenologists worked up a pseudo-science, pretending to chart many areas on the surface of the brain and analyze the traits and capacities by the “bumps” on the surface of the skull. Of course the outside surface of the skull has no real relationship to what the brain immediately beneath may be doing. A bump of “philoprogenitiveness” may have been produced by a kick from a playmate’s heavy boot in childhood, which the urchin had never reported to his fond but fussy parents.
Yet with all these areas of special duties and the labyrinth of apparatus there are evidently masses of brain substance we can perfectly well get along without. I suppose that there is still on exhibition at the Warren Anatomical Museum of the Harvard Medical School the skull of a New Hampshire quarry worker and the four-foot crow bar which went in by his eye, traversed his brain, and came out through the top of his skull. Apparently the only change after this misadventure was that whereas he had previously been a quiet gentle soul, he became irritable and very profane. Neurologists and psychiatrists as well as cynics realize that people can get along without much of the cerebrum, or thinking part of the brain.
Behind this fore part of the brain, or cerebrum, is the cerebellum, just where the bulge of your skull is, above the back of your neck. This has mostly to do with the movements of the body and is larger in many animals than in man. Then comes the medulla oblongata, which is really a big bulging at the beginning of the spinal cord. The cord emerges through a hole in the bottom of the skull, called the foramen magnum, which means the big window.
The human brain through the ages has developed into undoubtedly the most complicated apparatus in existence. It has millions of interrelationships. But it has had to sacrifice efficiency in a few things to this incredible versatility. It also emphasizes this eternal truth, that the higher up the animal, the longer is its youth.
There is an interesting and graphic illustration of the quick development of lower animals in a classic book, The Hunting Wasps, by J. H. Fabre. When one of these wasps is born, its parents have been dead for nearly a year. Without help it cleans itself of the remains of its cocoon, digs itself out from its cave, and starts off hunting.
There is only one kind of insect that it wants and it even insists on having a female. When it meets up with its prey, which is large and well armored, it seizes it and plunges a stinger into the one minute vulnerable place where it can reach a certain nerve ganglion. It never misses. Here it injects a drop of poison which does not kill but paralyzes. It carries the live but helpless victim to its cave and lays an egg at just the right spot on it. Having stored the larder with a number of these fresh provisions, it seals the cave, leaving the offspring to feast and rest and grow for the next ten months, when the whole procedure will be repeated by the new generation.
How different with the human child! When born it is absolutely helpless. It needs constant care and attention for years. But, if all goes well, the brain may develop to perform prodigious feats of thought. The wasp’s brain never develops in the slightest after birth. On its first expedition it is as efficient as it ever will be. Fabre performed many experiments to test its power of adaptation. It had none. When presented with a difficulty that the slightest deviation from its normal procedure would overcome, the experienced wasp was as helpless as a newborn babe.
But nature is a simple-minded lady. First things are first with her. In the case of the nervous system the first things are those which keep the animal body alive and functioning. Memories, ideas, and reasoning, all those things which we take pride in calling thinking, come late. The dinosaurs, living millions or billions of years ago, evidently had nervous systems which functioned well for their everyday activities. But what we call the higher faculties developed slowly. Comparatively, in the eons of time that have elapsed since life first appeared upon the earth, these must be considered young and tender.
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