The relationship between sexual activity and the nervous system

 The nervous system is the main skill regulation system in the human body. Under the unified regulation of the nervous system, each organ system in the body completes different functions to adapt to the changes in the internal and external environment and maintain the normal life activities.

 

The basic way in which the nervous system achieves its regulatory function is reflex activity. For example, the hand felt the boiling kettle come back right away, we call this process reflection, reflection events of complete requires neural pathways, neural pathways can also be called a reflex arc, reflex arc is composed of sensors, afferent nerve, central, efferent nerve, effector of five parts, such as in the example above, the hand skin is receptors, touch the water to produce hot feeling, this feeling arrive afferent nerve ganglia, the cerebral cortex, issue from the command center to efferent nerve of effector - arm muscle, muscle contraction, hand will shrink back. Although the process involves five parts, the nerve conduction is so rapid that the continuous action is done almost instantaneously. It's a simple reflex, of course, and sexual activity is a lot more complicated because it involves mobilizing the whole body in a lot of undivided reflexes, but the basic idea is the same.

The nerve mechanism that regulates splanchnic activity is called function nervous system altogether, include sympathetic nerve and parasympathetic nerve two parts. Most organs are innervated by both sympathetic and parasympathetic nerves, and the two types of nerves often have opposite effects on the same organ. For example, parasympathetic nervous excitement may cause the detrusor of the bladder to contract and the sphincter of the bladder to relax, thus contributing to urination. When sympathetic nerves are excited, bladder detrusor relaxes, bladder internal sphincter contracts and inhibits urination.

The control plant nerve activity has two levels of center, spinal cord has the primary center that regulates plant sex function. Some of the most basic reflex activities in the human body can be completed in the spinal cord center, such as vascular tone reflex, sweat reflex, urination reflex, defecation reflex, erectile reflex and so on. The human brain is the higher center for regulating vegetative functions. If the higher animal higher center is damaged, the movement function of the body will be seriously affected, the plant function will also be affected, lost the ability of fine regulation.

At the beginning of the 20th century, Pavlov established the theory of advanced neural activity through scientific experiments. The basic mode of higher neural activity is mainly conditioned reflex, which is one of the higher skills of the brain. Conditioning is acquired during ontogenesis.

Human sexual activity is regulated by the vegetative nerve, there will be penile erection, ejaculation, vaginal shrinkage, vaginal leakage increased, pelvic muscle involuntary suction contraction and a series of changes. These activities are controlled by both the primary centers of the spinal cord and the higher centers of the brain.

Animal sexual activity is a conditioned reflex, when the hormone changes in the body, produce estrus phenomenon, such as the encounter of the opposite sex, will occur immediately mating action.

But the human sexual activity has the function of both the first signal system and the second signal system. People not only produce sexual excitement after being stimulated by specific images of the opposite sex, but also have sexual response after receiving abstract stimuli such as words. On the other hand, the human brain has a strong inhibitory effect on sexual activity, so that the human brain does not immediately convert to sexual behavior despite the sexual impulse.

The erection of the penis through masturbation does not need to pass through the brain, but belongs to the reflex activity controlled by the primary center -- the spinal cord. Pass the stimulation such as the vision not flesh and the erectile that produces must pass cerebrum advanced center.

 

In the neuromodulation of sexual activity, there are also differences between men and women: men in the sexual activity of the second signal system seems to be more than women, to all kinds of signals have a strong response, but women need to receive caress - pure physical contact stimulation, to achieve sexual excitement.