Medulla OblongataPiloerectionBrain StemLateral Medullary SyndromeThermoreceptorsForamen MagnumKidney MedullaProlactin-Releasing HormoneReticulumSpinal CordBrainAutonomic PathwaysSolitary NucleusHypothalamusRespirationReticular FormationCerebellumMagnetic Resonance ImagingChemoreceptor CellsVagus NerveCatsSudden Infant DeathGerminomaNeuronsRats, Inbred StrainsPressoreceptorsScrapieCatecholaminesBrain ChemistryRats, Sprague-DawleyProto-Oncogene Proteins c-fosReference StandardsBlood PressureImmunohistochemistryAneurysm, RupturedNorepinephrineSympathetic Nervous SystemPonsRats, Inbred WKYReference ValuesCentral Nervous SystemRats, WistarNeural PathwaysSerotoninCarbon DioxideRats, Inbred SHRHeart RateSheepBrain NeoplasmsTissue DistributionTime FactorsRNA, Messenger