The neuronal synapses were observed under electron microscope (50kx ×). (A–C) showed the synapses of hippocampal neurons in sham, model and DNLA groups, respectively; (D–F) showed the synapses of cortical neurons in the sham, model and DNLA groups, respectively. (G) showed the effects of DNLA on the number of neuronal synapses in Aβ25−35-induced mice. Data were expressed as mean ± SEM (n = 3). ∗P < 0.05 vs. the sham group; #P < 0.05 vs. the model group.