SynapsesDendritic SpinesGonadal HormonesHippocampusSynaptophysinDendritesExcitatory Postsynaptic PotentialsNeuronsPyramidal CellsSynaptic TransmissionRats, Sprague-DawleyOvariectomyPresynaptic TerminalsCells, CulturedMicroscopy, ElectronImmunological SynapsesNeuronal PlasticityPost-Synaptic DensitySynaptic MembranesReceptors, AMPAInhibitory Postsynaptic PotentialsPatch-Clamp TechniquesElectric StimulationNeural InhibitionLong-Term PotentiationReceptors, N-Methyl-D-Aspartategamma-Aminobutyric AcidNeuromuscular JunctionGlutamic AcidSynaptic PotentialsExcitatory Amino Acid AntagonistsBone DensityInterneuronsSynaptic VesiclesAction PotentialsNerve Tissue ProteinsGuanylate KinaseReceptors, GlutamateElectrophysiologyNeurotransmitter AgentsMiniature Postsynaptic PotentialsElectrical SynapsesLong-Term Synaptic DepressionGABA AntagonistsAnimals, NewbornReceptors, PresynapticReceptors, GABA-APurkinje CellsEvoked PotentialsAxonsModels, Neurological6-Cyano-7-nitroquinoxaline-2,3-dioneMotor Neurons2-Amino-5-phosphonovalerateReceptors, CholinergicMembrane PotentialsRats, WistarReceptors, Metabotropic GlutamateMossy Fibers, HippocampalCerebellumCalciumReceptors, GABA-BMembrane ProteinsOrgan Culture TechniquesBicucullineTime FactorsQuinoxalinesNeural PathwaysExcitatory Amino Acid AgonistsVesicular Glutamate Transport Protein 1NeocortexTetrodotoxinPopulation DensityNerve FibersPhosphinic AcidsMice, Inbred C57BLAplysiaCA1 Region, HippocampalN-MethylaspartateCell Adhesion Molecules, NeuronalCerebral CortexNeurons, AfferentReceptors, NeurotransmitterMice, KnockoutExcitatory Amino Acid AgentsImmunohistochemistryCentrifugation, Density GradientBrain StemAgrinGreen Fluorescent Proteinsalpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic AcidSpinal CordGABA-A Receptor AntagonistsThalamusGlycinePicrotoxinNerve NetReceptors, Kainic AcidAfferent PathwaysBrain