Raphe NucleiAnalgesiaPeptostreptococcusAnalgesia, EpiduralAnalgesia, ObstetricalPeptococcusBrain StemThermoreceptorsPeriaqueductal GraySerotoninReticular FormationMorphineAnalgesics, OpioidAnalgesia, Patient-ControlledMedulla OblongataPainEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Physical StimulationNeuronsPeriapical AbscessAfferent PathwaysMicroinjectionsPain, PostoperativeRats, Sprague-DawleySpinal CordSuppurationHot TemperaturePain MeasurementBupivacaineElectric StimulationAnesthetics, LocalAcupuncture AnalgesiaFentanylAnalgesicsAction PotentialsAnesthesia, EpiduralSexologyPsychoanalysisMeperidineLabor PainSufentanilNerve BlockInjections, SpinalTryptophan HydroxylaseBacteria, AnaerobicSerotonergic NeuronsLabor, ObstetricAnesthesia, Obstetrical8-Hydroxy-2-(di-n-propylamino)tetralinGram-Positive Bacterial InfectionsAmidesAnesthesia, SpinalTramadolDouble-Blind MethodReceptor, Serotonin, 5-HT1AAnalgesics, Non-NarcoticPain ThresholdNaloxoneReceptors, Serotonin, 5-HT1Cesarean SectionReceptors, Opioid, muPostoperative Nausea and VomitingInterpleural AnalgesiaSerotonin Receptor AgonistsProto-Oncogene Proteins c-fosDrug ToleranceCatsAnesthesia, GeneralConscious SedationKetorolacLabor Stage, FirstHydromorphoneRats, WistarLidocaineReceptors, SerotoninPain ManagementAnesthesia, CaudalSerotonin AntagonistsReceptors, OpioidElectroacupunctureClonidineDental PlaqueAbscessAnesthesia and AnalgesiaKetamineFemoral NervePeriodontitisAutoreceptorsPregnancyPirinitramideHypnotics and SedativesButorphanolAlfentanilDose-Response Relationship, DrugNalbuphineNarcotic AntagonistsAnesthetics, CombinedAnesthesia, ConductionBehavior, AnimalThoracotomy