What is the Sympathetic Nervous System?
Sympathetic nerve: The low-level center is located in the lateral nucleus of the middle band of the gray matter lateral column of the spinal cord chest 1 to waist 2 or waist 3. Presympathetic ganglion fibers originate from cells in this nucleus, so the sympathetic nerve is also called the sympathetic or thoracolumbar.
Sympathetic nervous system
- Chinese name
- Sympathetic nervous system
- Foreign name
- sympathetic nerve system
- Applied discipline
- Medicine, Psychology
- Sympathetic nerve: The low-level center is located in the lateral nucleus of the middle band of the gray matter lateral column of the spinal cord chest 1 to waist 2 or waist 3. Presympathetic ganglion fibers originate from cells in this nucleus, so the sympathetic nerve is also called the sympathetic or thoracolumbar.
- The surrounding part of the sympathetic nerve includes the sympathetic trunk, the sympathetic ganglion, and the branches and sympathetic plexus issued by the ganglia. According to the location of the sympathetic ganglion, it can be divided into the paravertebral segment and the anterior segment.
- The central part is the lower center of the sympathetic nerve, located in
- Activities are relatively extensive, stimulating the sympathetic nerves can cause abdominal viscera and peripheral blood vessel constriction, strengthening and acceleration of heart beat, hypermetabolism, dilated pupils, and increased tired muscle working ability. The activity of the sympathetic nerve mainly guarantees the physiological needs of the human body in a state of stress.
- (1 pair
- (1) Tension: For example, after the heart sympathetic nerve is cut, the heart rate slows down; after the sympathetic nerve that innervates the iris is cut, the pupil shrinks.
- (2) Affected by the functional state of the effector: For example, stimulating sympathetic nerves can cause uterine movement inhibition in infertile animals, but it can enhance their movement in pregnant uterus.
- (3) The significance of regulating the overall physiological function: When the environment changes rapidly, the sympathetic nervous system can mobilize the potential of many organs of the body to adapt to changes in the environment.