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THE MALE SEXUAL ORGANS: NERVE SUPPLY OF THE PENIS - THE SYMPATHETIC NERVOUS SYSTEM
THE SYMPATHETIC NERVOUS SYSTEM is the accelerator of the human engine, like the accelerator of a car. It is concerned with the instantaneous preparation of the body for defence against external threats. The caveman or the wild beast, when attacked, had two alternatives, depending upon the type of threat visualised by the thinking brain. The animal or man may decide that it is better to run away (he who runs away lives to fight another day), or he may decide to fight it out and perhaps be killed. This is called the FIGHT OR FLIGHT RESPONSE. The body, when mobilised by the sympathetic nervous system, resembles a boxing-champion ready for a fight. The muscles become tense and alerted, the heart beats faster to supply more blood to the muscles and the brain, and the breathing becomes more rapid to supply increased oxygen to the blood. (Extra glucose is burnt by the muscles to produce extra energy to fight the opponent or run away). The overheated body combustion is cooled down by excessive sweating.
Modern man stimulates the sympathetic nerve to produce stress. (This subject is dealt with in detail in my book Rock around the Clock). During the stress of a life-and-death situation, obviously the mechanism of sex is kept in abeyance, as the man has either to fight or run away. It is fitting, therefore, that the sympathetic nerve which produces stress is also responsible for contracting the small arteries in the penis, resulting in blood returning to the body and loss of erection. The sympathetic nerve is also the motor nerve for producing ejaculation.
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Men's Health-Erectile Dysfunction