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Updated: June 6, 2025
It is not, therefore, stimulation of the intellect, but excitement of the feelings, that can be shown from physiological data to have an injurious effect upon the vaso-motor nerves of the uterus, or the ganglionic nerves of the ovaries, or, in other words, can be concerned in the production of uterine hæmorrhage. To be just, however, it must be admitted, that still another view is possible.
The vaso-motor nerves have their governing centre in that upper portion of the spinal cord which is within the skull, the so-called medulla oblongata. When the spinal cord is divided, the vessels are cut off from the influence of this vaso-motor centre, and at once dilate, profoundly affecting the blood-current by doing so.
If the vaso-motor centre of the brain is only influenced when the ganglia at the base are called into activity, and if their activity coincides with emotion, and not with thought, whose organ is much more remote, in the cerebral hemispheres, it should follow that emotion, and not thought, should most easily influence the vaso-motor centre, and be followed by peculiar modifications of the ganglionic system and of the circulation.
Ten years earlier Henle had demonstrated the existence of annular bands of muscle fibres in the arterioles, hitherto a much-mooted question, and several tentative explanations of the action of these fibres had been made, particularly by the brothers Weber, by Stilling, who, as early as 1840, had ventured to speak of "vaso-motor" nerves, and by Schiff, who was hard upon the same track at the time of Bernard's discovery.
The third class of facts include those, also insisted upon, that indicate a peculiar influence of the emotions upon the circulation and the vaso-motor nerves.
But if stimulation of the brain does not paralyze, it must increase the tonicity of the vaso-motor centre, and hence the force and regularity of the circulation. Up to a certain point, these characters do indeed increase, with increase of pressure in the cerebral blood-vessels.
The Skin as a Heat-regulator. The great regulator of the bodily temperature is, undoubtedly, the skin, which performs this function by means of a self-regulating apparatus with a more or less double action. First, the skin regulates the loss of heat by means of the vaso-motor mechanism.
A distended or enlarged vein. Pertaining to or possessing blood or lymph vessels. Causing motion to the vessels. Vaso-motor nerves cause contraction and relaxation of the blood-vessels. Venæ Cavæ, pl. of Vena Cava. "Hollow veins." A name given to the two great veins of the body which meet at the right auricle of the heart Pertaining to, or contained within, a vein. Ventilation.
These facts, and many others that might be quoted, are pertinent to our subject, on account of the influence exercised over the ganglionic centres by the development and functional activity of those of thought. Stimulation of the cerebral hemispheres is one of the most powerful means of counteracting paralysis of the vaso-motor centre, with all its consequences.
The relation of the cerebrum to cutaneous diseases has been studied much of late, and it is now held that the cutaneous eruptions are mainly due to the degree of inhibiting effect exerted upon the vaso-motor center.
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