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"Ah no!" said Amyas, burying his head in the tankard, and then mimicking Frank, "avoid strong ale o' mornings. It heats the blood, thickens the animal spirits, and obfuscates the cerebrum with frenetical and lymphatic idols, which cloud the quintessential light of the pure reason. Eh? young Plato, young Daniel, come hither to judgment!
Professor Draper, another eminent authority, says: "I find that the cerebrum is absolutely analogous to in construction to any other nervous arc. It is composed of centripetal and centrifugal fibres, having also registering ganglia.
It has in it certain cell centres that give origin to six of the cranial nerves. The third division of the brain is the cerebellum. This is a single mass supported by the isthmus. It is situated posterior to the cerebrum, from which it is separated by a transverse fold of the membranes covering the brain. This mass of nerve tissue is much smaller than the cerebrum.
In the midbrain, bulb, and spinal cord fibers are found: first, that connect these parts with the cerebrum and cerebellum above; second, that pass into and become a part of the nerves of the body; and third, that connect the opposite sides of these parts together.
We must fall back on an ancient personalization of forces, and our minds rest easier when we think of a Planner operating in all of us and perhaps smiling as He witnesses our strivings. As we study the nervous systems of animals, we find that with the apparent growth of intelligence there is a development of that part of the brain called the cerebrum.
Certain murderers of vile propensities have been so changed by an operation on the cerebrum that they have no power of recalling their past life and are incapable of uttering an oath. And what is more strange, they are intent on leading an upright life and being intensely religious withal.
Thus we find in the lowest order of fishes that all they possess of brain matter is a small protuberance at the end of the spinal cord. As the species and families rose in the scale of evolution, the brain developed proportionately from behind forward and became differentiated into three distinct divisions: the medulla oblongata, the cerebellum, and the cerebrum.
Brain. The soft mass of nerve tissue filling the upper cavity of the skull. Its cellular tissue is gray, and its fibrous tissue white. With the spinal cord it controls all the sensory and motor activities of the body. Cer e bel'lum. The part of the brain lying below the hind part of the cerebrum. Cer'e brum.
The white matter of the cerebrum, studded with red points, could scarcely be distinguished, when it was incised, by its natural whiteness; and the pia-mater, or internal vascular membrane covering the brain, resembled a delicate web of coagulated red blood, so tensely were its fine vessels engorged.
On the upper side it is divided by a deep longitudinal fissure into two halves, the cerebral hemispheres; these are connected by the corpus callosum. The large cerebrum is separated from the small cerebellum by a deep transverse furrow. The latter lies behind and below, and has also numbers of furrows, but much finer and more regular, with convolutions between, at its surface.
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