The penis is richly supplied with nerves which control the blood vessels. It is necessary that you should be familiar with the working of the nervous system before learning about the nerve supply of the penis and how it produces a normal erection and how an imbalance of the nervous mechanism can result in sexual inadequacy.

The vast, uncharted and unknown kingdom of the human body (you probably know more about your car than your body!) is ruled and regulated by two ministers: the External Affairs Minister—the Central Nervous System (CNS), which responds and regulates the body to the external environment, and the Home Minister—the Autonomic Nervous System (ANS), which looks after law and order in your body, that is, taking care of all the vital functions like regulating heart rate, circulation, digestion and glandular secretions, and, last but very important, erection of the penis and the mechanism of ejaculation.

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Men's Health-Erectile Dysfunction