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Updated: June 6, 2025
None of these effects are observed after a simple act of thinking, unattended by emotion. 5th. Probably on account of such an influence upon the vaso-motor nerves, the blood vessels, and, consequently, the processes of nutrition, the evolution of emotions is attended with much greater fatigue than is that of thought.
The reverse condition occurs in the act of turning pale. Then the result of the mental emotion is to cause the vaso-motor nerves to exercise a more powerful control over the capillaries, thereby closing them, and thus shutting off the flow of blood. Experiment 91. Hold up the ear of a white rabbit against the light while the animal is kept quiet and not alarmed.
Quinine is, when given for a long period of time, a true poison to the vaso-motor nerves. The question, then, is to replace quinine, and the alkaloids which possess an analogous physiological action, by an agent the efficacy of which against, chronic malarial poisoning may be greater and the dangers of its employment less. A happy chance has led Dr.
In connection with it, physical exercise, pushed to the point of exhausting the spinal cord, and the peculiar centre in its lumbar portion, or mental effort so excessive and prolonged as to exhaust the brain, and the general vaso-motor centre, might become causes of menorrhagia.
That the degree of exhaustion in the cerebro-spinal system, necessary to determine vaso-motor paralysis, is very great, and much transcends that likely to be induced by the mental exertion required in the ordinary curriculum of a girl's school. 3d.
The clinical facts for such a supposition are those in which the occurrence of an emotion is followed by flushing of the face, acceleration of the pulse, hot or cold perspirations, phenomena all indicative of dilatation of the blood-vessels, with temporary paralysis of their nerves and of their vaso-motor centre.
This, too, is beyond the control of the will, and is brought about by the vaso-motor nerves of the sympathetic system through a reflex arrangement, the center for which is the medulla oblongata. Need of Rest. The life of the body, as has been emphasized in the preceding chapters, is subject to constant waste going on every moment, from the first breath of infancy to the last hour of old age.
For it is known that vaso-motor paralysis is not of itself sufficient to induce hæmorrhage, unless the tension of the blood-current be coincidently raised. See Bouchard, Pathogenie des Hæmorrhagies. The "uterine epistaxis" of malignant fevers are evidently foreign to our subject, as also the hæmorrhages of subinvolution, or of the menopause.
In the kidneys, as elsewhere, the vaso-motor nerves are distributed to the walls of the blood-vessels, and modify the quantity and the pressure of blood in these organs. Thus, some strong emotion, like fear or undue anxiety, increases the blood-pressure, drives more blood to the kidneys, and causes a larger flow of watery secretion.
That therefore, when vaso-motor paralysis, as indicated by uterine hæmorrhage, has occurred apparently in consequence of such mental exertion, it is really due to some other conditions existing with this. Of these we have already insisted upon two sedentary position and deficiency of physical exercise.
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