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KMID : 0376219860230010217
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Chonnam Medical Journal
1986 Volume.23 No. 1 p.217 ~ p.224
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Role of the Cervical Sympathetics on the Reflex Parotid Secretion in Cats
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Abstract
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In ketamine-anesthetized cats, the parotid duct was cannulated with a polyethylene tube and the salivary flow upon nerve stimulation was recorded. The effect of stimulating or severing the cervical sympathetic on the reflex parotid secretion which was evoked by stimulating the central stump of the lingual nerve or the pharyngeal branch of the vagus was investigated.
Spontaneous parotid secretion was not observed. Stimulation of the central stump of the lingual nerve or pharyngeal branch of the vagus elicited copious parotid secretion reflexly and the response was not affected by previous section of the cervical sympathetic, while it was completely abolished by severing the auriculotemporal nerve. And further, the reflex parotid secretion was only decreased by superimposed stimulation of the cervical sympathetic or by the administration of norepinephrine. The effect of the cervical sympathetic or norepinephrine on the reflex salivation was abolished by pretreatment with phenoxybenzamine. Stimulation of the central stump of the lingual nerve elicited parotid secretion and increased the blood flow. These responses were decreased either by stimulation of the cervical sympathetic or by the administration of norepinephrine.
These results indicate that the efferent pathway of the reflex parotid secretion evoked by stimulating the central stump of the lingual nerve or the pharyngeal branch of the vagus is the auriculotemporal nerve, and that the cervical sympathetic is not involved in the reflex component and plays a role in inhibiting parotid salivation by decreasing blood flow to the gland.
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