Overview of the Autonomic Nervous System By Phillip Low, MD, College of Medicine, Mayo Clinic Reviewed / Revised Sep 2021 | Modified Sep 2022 View Patient Education Anatomy Physiology Etiology of Autonomic Insufficiency Evaluation of Autonomic Insufficiency Topic Resources The autonomic nervous system Sympathetic Innervation Parasympathetic Innervation Divisions of the Autonomic... The autonomic nervous system regulates physiologic processes.