Trigeminal Nucleus, SpinalTrigeminal NucleiTrigeminal Caudal NucleusTrigeminal NervePurkinje CellsCentral Nervous System SensitizationFacial PainBrain StemTrigeminal GanglionSubstantia GelatinosaAfferent PathwaysReceptors, Calcitonin Gene-Related PeptideSpinal CordNociceptorsCell NucleusNeurons, AfferentRats, Sprague-DawleyPhysical StimulationPurkinje FibersNeuronsElectric StimulationDihydroergotamineVibrissaeSumatriptanMeningesPonsWheat Germ Agglutinin-Horseradish Peroxidase ConjugateMasseter MuscleCochlear NucleusSpinal Cord InjuriesMedulla OblongataDura MaterProto-Oncogene Proteins c-fosStilbamidinesNeural PathwaysNerve FibersDental PulpCats