The sympathetic nervous system also part of the autonomic nervous system originates in the spinal cord specifically in the thoracic and lumbar regions it controls the bodys fight or flight responses or how the body reacts to perceived danger. The autonomic nervous system is divided into the sympathetic nervous system and parasympathetic nervous system the sympathetic division emerges from the spinal cord in the thoracic and lumbar areas terminating around l2 3. The enteric nervous system is a third division of the autonomic nervous system that you do not hear much about the enteric nervous system is a meshwork of nerve fibers that innervate the viscera gastrointestinal tract pancreas and gall bladder. Nervous systems so you may recall that the somatic nervous system is the part of the nervous system that voluntarily responds to external stimuli and that the autonomic nervous system is the . The autonomic nervous system is the part of the nervous system that supplies the internal organs including the blood vessels stomach intestine liver kidneys bladder genitals lungs pupils heart and sweat salivary and digestive glands
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