Medulla OblongataBrain StemPiloerectionLateral Medullary SyndromeThermoreceptorsForamen MagnumKidney MedullaProlactin-Releasing HormoneSpinal CordReticulumBrainAutonomic PathwaysSolitary NucleusHypothalamusReticular FormationRespirationCerebellumMagnetic Resonance ImagingVagus NerveChemoreceptor CellsNeuronsCatsPonsEvoked Potentials, Auditory, Brain StemSudden Infant DeathRats, Sprague-DawleyGerminomaRats, Inbred StrainsPressoreceptorsScrapieProto-Oncogene Proteins c-fosBrain ChemistryCatecholaminesImmunohistochemistryBlood PressureNorepinephrineNeural PathwaysAneurysm, RupturedSympathetic Nervous SystemCentral Nervous SystemSerotoninBrain Stem NeoplasmsRats, WistarRats, Inbred WKYCarbon DioxideHeart RateBrain NeoplasmsRats, Inbred SHRSheepTissue DistributionTime FactorsRNA, Messenger