Medulla OblongataPiloerectionBrain StemLateral Medullary SyndromeThermoreceptorsForamen MagnumMyelitis, TransverseKidney MedullaProlactin-Releasing HormoneSpinal CordReticulumBrainAutonomic PathwaysColon, TransverseSolitary NucleusHypothalamusRespirationMagnetic Resonance ImagingReticular FormationCerebellumChemoreceptor CellsVagus NerveCatsSudden Infant DeathGerminomaNeuronsRats, Inbred StrainsPressoreceptorsScrapieRats, Sprague-DawleyBrain ChemistryCatecholaminesProto-Oncogene Proteins c-fosBlood PressureTransverse SinusesImmunohistochemistryAneurysm, RupturedNorepinephrinePonsSympathetic Nervous SystemRats, WistarNeural PathwaysCentral Nervous SystemRats, Inbred WKYSerotoninCarbon DioxideSheepHeart RateRats, Inbred SHRBrain NeoplasmsTissue DistributionTime FactorsRNA, Messenger