Trigeminal Nucleus, SpinalTrigeminal NucleiTrigeminal Caudal NucleusTrigeminal NerveCell NucleusFacial PainVibrissaeDihydroergotamineSumatriptanTrigeminal GanglionBrain StemAfferent PathwaysMeningesWheat Germ Agglutinin-Horseradish Peroxidase ConjugatePonsNeurons, AfferentMasseter MuscleCochlear NucleusCentral Nervous System SensitizationRats, Sprague-DawleyNociceptorsNeuronsProto-Oncogene Proteins c-fosPhysical StimulationMedulla OblongataDura MaterStilbamidinesDental PulpSubstantia GelatinosaNeural PathwaysCapsaicinElectric StimulationVesicular Glutamate Transport Protein 2Receptors, Calcitonin Gene-Related PeptideCortical Spreading DepressionCatsMasticatory MusclesNerve FibersMechanoreceptorsMesencephalonJawCalcitonin Gene-Related PeptideMigraine DisordersSomatosensory CortexEvoked PotentialsNucleus AccumbensThalamusTemporomandibular JointAction PotentialsThalamic NucleiSolitary NucleusImmunohistochemistrySerotonin Receptor AgonistsNeural InhibitionSpinal CordAnimals, NewbornRats, WistarPosterior Horn CellsRaphe NucleiCerebellar NucleiBrainSeptal NucleiActive Transport, Cell NucleusArcuate NucleusCaudate NucleusParaventricular Hypothalamic NucleusPainElectrophysiologyBrain MappingSuprachiasmatic NucleusRed NucleusTime Factors