In the autonomic nervous system there are two subdivisions: sympathetic and parasympathetic. The nerve centers of the sympathetic subdivision are located in the gray matter of the spinal cord, from its cervical to the sacral segments. Excitation from the nerve centers goes to the paired neurons of the sympathetic trunk, which stretch left and right along the spine. Some sympathetic nodes are located in the nerve plexuses on the ventral side of the aorta – in the solar (celiac) plexus. The nerve centers of the parasympathetic subdivision are located in the brain and sacral segments of the spinal cord. The parasympathetic subunit includes the paired vagus nerve with centers in the medulla oblongata. This nerve goes near the sympathetic trunk and gives processes to the parasympathetic nodes located not far from the organs associated with them.
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