Supraoptic NucleusOxytocinVasopressinsHypothalamus, AnteriorParaventricular Hypothalamic NucleusMilk EjectionHypothalamusPituitary Gland, PosteriorNeurosecretory SystemsNeuronsArginine VasopressinNeurophysinsNeurosecretionWater-Electrolyte BalanceOsmotic PressureSaline Solution, HypertonicRats, Sprague-DawleyProto-Oncogene Proteins c-fosDehydrationAction PotentialsDiuresisHypertonic SolutionsRats, WistarLactationElectrophysiologyMetaraminolNaloxoneOsmosisPatch-Clamp TechniquesInjections, IntraventricularRats, Inbred StrainsReceptors, OxytocinMicroinjectionsDynorphinsWater DeprivationOsmolar ConcentrationHypothalamo-Hypophyseal SystemAnterior Hypothalamic NucleusPresynaptic TerminalsTetraethylammoniumRats, BrattleboroMembrane PotentialsImmunohistochemistryElectric StimulationPreoptic AreaAutonomic PathwaysMidline Thalamic NucleiNarcotic AntagonistsHypothalamic Area, LateralSodium ChlorideEvoked PotentialsThirstOrnipressinReceptors, Opioid, kappaGABA AntagonistsTetrodotoxinHistamine Agonists