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Updated: June 7, 2025
In pure motor aphasia the lesion is in the posterior part of the left third frontal convolution; in cases of pure sensory aphasia, the lesion is in the left first temporal convolution.
Buchanan mentions the history of a case in a woman of twenty-one, who, while working in a mill, was struck by a bolt. Her skull was fractured and driven into the brain comminuted. Hanging from the wound was a bit of brain-substance, the size of a finger, composed of convolution as well as white matter.
PSYCHOMETRIC. I have explored every portion of the brain with care and minuteness by the psychometric method, even tracing the convolutions and their anfractuosities, and observing from point to point how beautifully and harmoniously the innumerable functions blend with each other; how the different portions of a convolution vary, and how the different conditions of the brain and different degrees of excitement modify the results; and these investigations have been carried on for years, until results were clearly established and over and over confirmed by psychometry, by experiment, and by consciousness.
Work should be the spontaneous expression of a man's best impulses. We grow only through exercise, and every faculty that is exercised becomes strong, and those not used atrophy and die. Thus how necessary it is that we should exercise our highest and best! To develop the brain we have to exercise the body. Every muscle, every organ, has its corresponding convolution in the brain.
She, too, knew what it was to be angry, to the point of revenge; had indeed come to Brockhurst not without purpose of that last tucked away in some naughty convolution of her active brain. But Brockhurst and its inhabitants had proved altogether more interesting than she had anticipated. This was the fourth day of her visit, and each day had proved more to her taste than the preceding one.
Q. Will you specify the nature of their deductions? A. I will first enumerate those which bear upon screws with two blades. When the relative resistance is 5.5 the ratio of pitch to diameter should be 1.006, and the fraction of the pitch or proportion of one entire convolution should be 0.454.
Thus the skull becomes thinner at the site of every active organ, and thicker over every convolution that is inactive. The translucency or opacity of the different parts of the skull, when a light is placed in its interior, generally indicates the active and inactive organs. Hence, many skulls of fine exterior reveal, upon interior examination, a degenerate character.
This being erected and wrought outside of a dwelling, the air will be forced into a convolution of pipe passing through a tank of water, like the worm of a still, and will issue by a check-valve at every stroke of the piston into the apartments to be cooled.
Every part has its special duty to perform. The part of the brain which lies in front of the ears has a different function from that which lies behind them. The parietal lobes of the brain are not placed in the skull for the same purposes which the frontal and occipital lobes represent. Every fibre has its function, every convolution its purpose.
It is further established, that the degree of asymmetry of the convolution of the two sides in the human brain is subject to much individual variation; and that, in those individuals of the Bushman race who have been examined, the gyri and sulci of the two hemispheres are considerably less complicated and more symmetrical than in the European brain, while, in some individuals of the chimpanzee, their complexity and asymmetry become notable.
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