Changes in Perfusion Pressure in the Mandibular Artery Induced by Functional Alterations of the Superior Cervical Ganglion

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Abstract
Blood pressures in the non-isolated mandibular artery of dogs were recorded during constant flow perfusion and the effects of various alternations on the superior cervical ganglia were studied. Electrical stimulation of the ganglion resulted in vasoconstriction, but application of tetraethylammonium chloride produced vasodilation. Severing the mandibular nerve, just prior to its entry into the mandibular foramen, resulted in vasodilation, probably becuase of released sympatnetic tone. Evidence was obtained which indicates that some sympathetic vasoconstrictor fibers synapse in the superior cervical ganglion.