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KMID : 0376219860230010173
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Chonnam Medical Journal
1986 Volume.23 No. 1 p.173 ~ p.180
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Role of the Cervical Sympathetics on the Consensual Reflex Submaxillary Secretion of the Cat
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Abstract
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In ketamine-anesthetized cats, both submaxillary ducts were cannulated with small polyethylene tubes and salivary flows through the tubes were recorded. Spontaneous secretion was not observed. Electrical stimulation of the central stump of the ventral gastric branch of the vagus elicited reflexly an abundant salivary secretion not only from the left submaxillary gland but also from the right one. This kind of reflex salivary secretion is called as "the consensual reflex secretion". This study was aimed at investigating the role of the cervical sympathetic on the consensual reflex submaxillary secretion. The consensual response to the afferent stimulation of the ventral gastric branch of the vagus was not affected by severing cervical sympathetic, while it was abolished by severing chorda tympani. The consensual response was decreased by superimposed stimulation of the cervical sympathetic with effective impulse, or by the administration of norepineprine, and these effects were abolished by the pretreatment with phenoxybenzamine. The inhibition of consensual salivary secretion by the stimulation of the cervical sympathetic was always accompanied by decreased blood flow.
These results indicate that the cervical sympathetic is not involved in the efferent pathway of the consensual reflex submaxillary secretion, and that the cervical sympathetic inhibits the consensual reflex submaxillary secretion by decreasing the blood flow to the glands. The fact that the cervical sympathetic is not the efferent pathway of the reflex seems to be against the hypothesis that there exist the sympathetic specific serectory fibers innervating submaxillary gland of the cat.
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