The organization of visceral sensory neurons in thoracic dorsal root ganglia (DRG) of the cat studied by horseradish peroxidase (HRP) reaction using the cryostat.

The organization of visceral sensory neurons in thoracic dorsal root ganglia (DRG) was studied by retrograde transport of horseradish peroxidase (HRP) from the central cut end of the left major splanchnic nerve of the cat. The majority of HRP-labeled cells were concentrated between T5 and T11. Within a DRG, labeled splanchnic neurons were found in all sectors. There was no consistent pattern of localization within the ganglion although clustering of visceral cell bodies was apparent. It may be that each clustered group of cells innervates individual viscera or reflects a degree of functional segregation.