Where are the nuclei of the autonomic nervous system (central and peripheral) located? What are the functions of the autonomic nervous system.

The autonomic nervous system performs internal processes of life that are not controlled by the human mind: maintaining homeostasis (the constancy of the internal environment of the body), regulating the functioning of the heart, intestinal motility and so on.
It is divided into sympathetic and parasympathetic. The first takes into account the rhythm of the heart, dilates the pupils, inhibits the action of the production of gastric juice, enhances ventilation of the lungs. And the parasympathetic section lowers blood pressure, reduces heart rate, increases intestinal motility and so on. In the central section, the nuclei of the autonomic nervous system are located in the brain (oblong, where the respiratory centers, the heart regulation center, etc. are located; and in the intermediate, the hypothalamic-pituitary system). And also in the spinal cord in the gray matter (reflex function)
And the peripheral department is represented by nerve nodes, plexuses.