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To sum up: My contention is, that the direct influence of emotional states upon bodily organs and functions has been greatly exaggerated; that it is exceedingly doubtful whether, for instance, any individual in a reasonable condition of health was ever killed by an imaginary or even an emotional shock; that there is surprisingly little valid evidence that the hair of any human being turned white in a single night, or was completely shed within a few hours, under the influence of fright, terror, or grief; that the effects upon bodily functions and secretions, digestion, etc., produced by emotion, are due to secondary effects of the latter, diverting the energy of the body into other channels and disturbing the general balance of its forces and blood-supply; that the actual percentage of cases in which the imagination plays the chief, or even a dominant part, is small, probably not to exceed five or ten per cent; that a very considerable share of the influence of mental impressions in the cure of disease is due to the relief of mental panic, permitting the rallying of the recuperative powers of the body, and to the extent to which they produce the reform of bad physical habits or surroundings or conditions.
The entire vascular system, arterial and veinous, would have to undergo successive unbuildings and rebuildings to make its channels everywhere adequate to the local requirements; since any want of adjustment in the blood-supply in this or that set of muscles, would entail incapacity, failure of speed, and loss of life.
I have provided the screw stopper with a spring catch, and ... usually docile when not hungry; slow and heavy in its movements, which are, of course, purely unconscious; any apparent excitement in movement being due to local irregularities in the blood-supply of the cerebellum, which, if I did not have it enclosed in a silver case that is immovable, I should expose and ..."
Puzzled as to how this could be, and suspecting that in some way his ligature around the artery had not been effective, he ordered the deer killed, and on examination was astonished to find that while his ligature had completely shut off the blood-supply from the source of that carotid artery, the smaller arteries had become enlarged so as to supply the antler with blood as well as ever, only by a different route.
Wishing to ascertain just what part the blood-supply on the opposite sides of the neck played in the process of development, or, perhaps more correctly, to see what effect cutting off the main blood-supply would have, Hunter had one of the deer of Richmond Park caught and tied, while he placed a ligature around one of the carotid arteries one of the two principal arteries that supply the head with blood.
But nature has made a provision for this possible stoppage of blood-supply from a single source, and has so arranged that some of the small arterial branches coming from the main supply-trunk are connected with other arterial branches coming from some other supply-trunk.
But a clear light was not thrown on the subject until Bernard's experiments were made in 1851. The experiments were soon after confirmed and extended by Brown-Sequard, Waller, Budge, and numerous others, and henceforth physiologists felt that they understood how the blood-supply of any given part is regulated by the nervous system.
No matter how bad the news or how serious the danger, if they fail to worry us or to frighten us, in other words, to set up this complicated train of muscular and blood-supply changes, then they have little or no effect upon our digestions or the metabolism of our liver and kidneys.
In the human being the brain is much more highly developed and complicated; and is, in addition, the seat of the mind, the intellect, and the affections. Like all the other tissues of the body, the brain receives its nourishment from the blood-vessels which pass through it, and its healthy maintenance is in a direct ratio to the condition of its blood-supply.
Percy injected the subject and dissected and described the mammary blood-supply. Hirst mentions a negress of nineteen who had nine mammae, all told, and as many nipples. The two normal glands were very large. Two accessory glands and nipples below them were small and did not excrete milk. All the other glands and nipples gave milk in large quantities.
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