Figure 4 Microscopic images of neuronal dendritic and dendritic spines in brain prefrontal cortex in male rats in different groups (5 μm thick sections, Golgi staining, magnification ×400). Micrograph of the brain prefrontal section in the sham group (a, neuronal dendritic, e, dendritic spines), showing normal structure. Micrograph of the brain prefrontal cortex section in morphine group (b, neuronal dendritic, f, dendritic spines) showing decreased number of dendritic spines owing to the oxidative stress caused by morphine. Micrograph of the prefrontal cortex section in the Falcaria vulgaris (150 mg/kg) group (c, neuronal dendritic, g, dendritic spines) showing normal structure. Micrograph of prefrontal section in morphine+F. vulgaris (150 mg/kg) (d, neuronal dendritic, h, dendritic spines) groups, showing normal structure.