Corpus StriatumCorpus LuteumCorpus Callosum3,4-Dihydroxyphenylacetic AcidDopamineBrainReceptors, DopamineAgenesis of Corpus CallosumBerberineSubstantia NigraRats, Inbred StrainsRats, Sprague-DawleyNeuronsCorpora AllataPenisNeostriatumCorpus Luteum MaintenanceLuteolysisProgesteroneBasal GangliaPenile ErectionLuteal CellsLuteal PhaseDinoprostPseudopregnancyCorpus Luteum HormonesEstrusMagnetic Resonance ImagingReceptors, Dopamine D2OvaryPregnancyPutamenOxidopamineOvulationEstrous Cycle