The autonomic nervous system has two divisions. It originates in the spinal cord and the medulla and controls homeostasis or the maintenance of the bodys systems. Anatomy Of The Autonomic Nervous System Autonomic Nervous System Medical School Studying Anatomy And Physiology Another component of the autonomic nervous system. . Hormones can alter the autonomic nervous system response as well. One is by releasing chemicals called hormones. Its primary function is to stimulate the bodys fight or flight response. In ition to the endocrine system the autonomic nervous system is instrumental in homeostatic mechanisms in the body. The sympathetic nervous system is a normally harmonized network of brain structures nerves and hormones that. By influencing the cells in the SAN nerve impulses and hormones can affect the speed at which. Sometimes autonomic nervous system is shortened as ANS. While there are other syste