Cranial IrradiationNeuronsHippocampusPrecursor Cell Lymphoblastic Leukemia-LymphomaBrain NeoplasmsCarcinoma, Small CellMethotrexateCombined Modality Therapy6-MercaptopurineInjections, SpinalAsparaginaseRadiation InjuriesNeurons, AfferentRadiotherapyDose-Response Relationship, RadiationLeukemia, LymphoidWhole-Body IrradiationCells, CulturedSmall Cell Lung CarcinomaRadiotherapy DosageDendritesMotor NeuronsVincristineLung NeoplasmsCentral Nervous System NeoplasmsRadiation Injuries, ExperimentalBrainAntineoplastic Combined Chemotherapy ProtocolsSynapsesOrgan Sparing TreatmentsIntelligenceTime FactorsRemission InductionEtoposidePatch-Clamp TechniquesAction PotentialsMeningeal NeoplasmsCytarabineSynaptic TransmissionUltraviolet RaysReceptors, N-Methyl-D-AspartateRats, Sprague-DawleyNerve Tissue ProteinsElectrophysiologyPyramidal CellsN-MethylaspartateDose FractionationAxonsIntelligence TestsGlutamic AcidDaunorubicinAnimals, NewbornSurvivorsDendritic SpinesMice, Inbred C57BLgamma-Aminobutyric AcidExcitatory Postsynaptic PotentialsRats, WistarCognition DisordersNeuritesMembrane PotentialsReceptors, AMPACerebellar NeoplasmsCalciumLearning DisordersGamma RaysPrednisoneNeuronal PlasticityBrain-Derived Neurotrophic FactorCyclophosphamideElectric StimulationImmunohistochemistrySurvival AnalysisDopaminergic NeuronsFood IrradiationKainic AcidMedulloblastomaCisplatinEmbryo, MammalianExcitatory Amino Acid AntagonistsNeural InhibitionGreen Fluorescent ProteinsAntimetabolites, AntineoplasticFollow-Up StudiesExcitatory Amino Acid AgonistsTreatment OutcomeDisease-Free SurvivalGABAergic NeuronsPresynaptic TerminalsCell SurvivalCerebral CortexSurvival RateReceptors, GABA-AReceptors, GlutamateModels, NeurologicalCell DeathTetrodotoxinRadiotherapy, AdjuvantNeurogenesisSignal Transduction