The nervous system represents set of the organs formed by a nervous tissue. The nervous system controls physiological functions, a metabolism, and also provides communication of an organism with an environment. Division of nervous system on somatic and vegetative is accepted. Somatic is responsible for functions supervised by us ? such, as speech, movement and a flexion of extremities. In turn, pulse depends on the vegetative, the sweating, palpitation etc. is included into structure of vegetative nervous system sympathetic and parasympathetic. The diaphoresis is regulated by sympathetic nervous system.
Adjustment of an internal, and also metabolism depends on sympathetic nervous system in an organism. The person allocates sweat, for example, in the course of functioning of sympathetic nervous system. Anatomic formations which are a part of sympathetic nervous system are located in the central nervous system and behind its limits. The vegetative nervous centers which are in a brain, supervise the spinal sympathetic centers. From them there are sympathetic nervous fibers which on an exit from a spinal cord are referred to the boundary sympathetic trunk, which locating in parallel a backbone.
All knots of a sympathetic trunk are bound by means of nervous plexuses to various departments of an organism. The solar plexus is formed by the fibers leaving thoracal knots. Those fibers that leave the bottom thoracal knots and top lumbar form a renal plexus. Practically all organs have own plexus. It is formed by separations and bonds of large sympathetic plexuses with the parasympathetic fibers approaching to organs. Plexuses which are responsible for transfer of excitation from one nervous cell to another, give rise to sympathetic fibers which go immediately to organs, vessels, tissues and muscles.
Sympathines are chemical substances (mediators) which serve transfer of excitation from sympathetic nerves to a working organ. The chemical compound of symphathines is close to a hormone of a cerebral layer of adrenals which adrenaline is called.
The most part of peripheric blood vessels is narrowed at a boring of sympathetic nervous fibers. Heart vessels do not get to this category ? those vessels which are responsible for a normal food of heart only. When vessels are narrowed, the rhythm of warm reductions becomes frequent, the person starts to sweat, at it the viscous dense saliva etc. Sympathetic nervous system is allocated has huge influence on many processes of a metabolism. Some of these processes are accompanied by rising of level of Saccharin in a blood, augmentation of coagulability of the blood, raised heat and thermolysis reduction that can cause a sweating that is a hyperhidrosis.
The principal causes leading to disturbance of work of sympathetic nervous system are infectious and toxic lesions of its formations. When functions of sympathetic nervous system are broken, the person can start to sweat, badly to feel. The sweating and a feeling sick can be accompanied also by disturbance of warm and digestive activity.
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