Sympathetic nervous system
The sympathetic nervous system, also called sympathetic nervous system, is an efferent peripheral nervous system that forms the autonomic nervous system along with the parasympathetic nervous system. The sympathetic nerve is antagonistic to the parasympathetic nerve, and when the sympathetic nerve is excited, it becomes tense to cope with a dangerous situation such as pulse increase, blood pressure rise and digestion suppression. This reaction is called a fight-escape reaction. The central part of the spinal cord is in the thoracic incision and enters the blood vessels or intestines. At this time, the spinal cord to the organ is connected to two neurons. Neurons close to the spinal cord are called power-saving neurons, and neurons close to the organ are termed neurons. In general, sympathetic nerves are relatively short in power saving neurons than in posterior neurons. Parasympathetic nerve is the opposite.