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KMID : 0376219830200040751
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Chonnam Medical Journal
1983 Volume.20 No. 4 p.751 ~ p.757
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Effects of Cervical Vagal Stimulation on the Reflex Salivation and the Blood Flow Changes of the Submaxillary Gland in Cats
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Abstract
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It is well known that there is an intimate relationship between blood flow and salivary secretion in the submaxillary gland. Stimulation of the chorda tympani causes a copious submaxillary secretion and greatly increases the blood flow, and a decrease in blood flow to the gland depresses salivary flow during the period of the nerve stimulation. As vagal stimulation seemed to evoke some blood flow changes in the gland, the effect of cervical vagal stimulation on the reflex submaxillary salivation and the increased blood flow induced by stimulating either the central cut end of pharyngeal branch of the vagus or that of lingual nerve was investigated in ketamine-anesthetized cats.
Stimulation of the distal cut end of the right cervical vagus slowed the heart and caused a fall in systemic arterial blood pressure and in blood flow through common carotid artery (C.C.A.) and simultaneously decreased the reflex submaxillary salivation and its blood flow. Stimulation of the distal end of cervical sympathetics at the upper-cervical level and ligation of C. C. A. on the ipsilateral side reduced the blood flow through C. C. A., submaxillary blood flow and reflex submaxillary salivation, without any significant changes in the heart rate. In systemic arterial blood pressure, cervical sympathetic stimulation elicited no change, whereas ligation of C.C.A. produced a small rise.
The results suggest that the reflex submaxillary salivation is always accompanied by an increase in blood flow due to vasodilatation and is decreased by diminished blood flow as a result of vasoconstriction or reduced cardiac output, and that the change in blood flow trough the gland is not directly related to those of systemic arterial blood pressure and heart rate.
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