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Purpose: To investigate the pharmacological effects of 2,3,5,4-tetrahydroxystilbene-2-O-β-D-glucoside (TSG) extracted from Polygonum multiflorum on the memory and movement functions and its mechanisms related to synapses and α-synuclein in the hippocampus and striatum in aged mice.Methods: The learning and memory ability of mice was detected by step-through passive avoidance task.The movement function was measured by the pole test and rotarod test.Transmission electron microscopy was used to detect the synaptic ultrastructure in the hippocampal CA1 region and striatum.