Histochem1cal Demonstration of Peripheral Autonomic Innervation in Canine Nasal Mucosa by Retrograde Axonal Transport of Horseradish Peroxidase

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Abstract
The deranged autonomic nervous system may play an important role in the pathogenesis of allergic disorders, such as rhinitis. Peripheral autonomic nervous pathways of the nasal mucosa in dogs were investigated with horseradish peroxidase (HRP). HRP was applied to the nasal mucosa, caudal nasal nerve, ethmoidal nerve, vidian nerve and pterygopalatine ganglion in 20 dogs, and retrogradely labeled neurons were observed in the superior cervical ganglion (SCG) and the pterygopalatine ganglion (PPG) by the blue reaction method. The vidian nerve, the maxillary branch of the trigeminal nerve, the caudal nasal nerve, the pterygopalatine nerve and the ethmoidal nerve may contain postganglionic sympathetic fibers which originate in SCG and terminate in the nasal mucosa. Other sympathetic pathways, such as those around the blood vessels, may also be a main route. The postganglionic parasympathetic fibers originating in PPG probably travelled along the caudal nasal nerve and the ethmoidal nerve.