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In brief, alcohol in any and every form is the enemy of successful and long-continued brain work. Other Physical Results of Intoxicants. What are some of the physical results observed? First, we note the failure of the vaso-motor nerves to maintain the proper tone of the blood-vessels, as in the turgid face and the congested cornea of the eye.
Independently of the three conditions where excessive menstruation is connected with vaso-motor paralysis, a fourth may be found directly in the excitement of the ovarian plexus of nerves. This evolution of nerve-force which accompanies the maturation of the ovule, is the immediate cause of the afflux of blood to the utero-ovarian vessels.
Those affected become soft and flaccid, exhibit tremors on attempted movement, and their excitability to the faradic current is diminished. Neuropathic atrophy is associated with lesions of the nervous system. It is most pronounced in lesions of the motor nerve-trunks, probably because vaso-motor and trophic fibres are involved as well as those that are purely motor in function.
This contraction is effected by stimulation of the fine nerves, called vaso-motor, that are distributed to these muscular fibres, and which are derived from the sympathetic ganglia, that form part of that same ganglionic system from which the nerves of the ovaries and other viscera are supplied.
The first are excessive activity of the ovarian nerves, derived from the hypogastric plexus; paralysis of uterine vaso-motor nerves, as a secondary result of this excessive action: exhaustion of these same vaso-motor nerves, as an element of general nervous exhaustion.
It is admitted, as the result of many experiments and pathological observations that need not here be quoted, that exhaustion of certain parts of the brain and spinal cord may induce vaso-motor paralysis, and that, if a cause for hæmorrhage is already in operation, a passive flow of blood may be indefinitely increased.
From them also we should infer in all cases where vaso-motor paralysis was apparently traceable to excess of cerebral activity, either that exhaustion had already occurred, or that the activity was not intellectual but emotional. In the first case, we should be immediately brought to our fourth possible condition for uterine hæmorrhage, dependent on modifications of the cerebro-spinal system.
If excessive action of the brain or spinal cord be analogous in its effects to galvanism of a spinal nerve, it might be supposed to cause vaso-motor paralysis and hæmorrhage. 3d. In general exhaustion of the nervous system, both of its ganglionic and cerebro-spinal apparatus, the vaso-motor nerves suffer with the rest, and the blood-vessels lose their tone in consequence.
The cold bath also stimulates the vaso-motor system, which regulates the circulation, by contracting and dilating the vessels, and increases the activity of the capillaries or small blood vessels.
In brief, all over the body, the nervous system, by its vaso-motor centers, is always supervising and regulating the distribution of blood in the body, sending now more and now less to this or that part. The Pulse.
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