part of ganglion sympathetic ganglion Any of the aggregations of cell bodies of primarily adrenergic neurons of the sympathetic nervous system, including the ganglia of the sympathetic trunks, the intermediate ganglia, the prevertebral ganglia, and some ganglionic cells in the autonomic plexuses. BTO:0001333 BrendaTissueOBO ganglion sympatheticum ganglion sympathicum sympathetic chain