Stained sections were viewed with an Olympus U-LH100HG microscope. Results: Result of Fluoro Jade B staining: Fluoro Jade B (+) neuronal cells was present predominantly in the dentate gyrus; positively in the olfactory bulb, in the anterior olfactory nucleus and in the cortical superficial layers after TMT injection. Result of BDNF immunostaining: TMT induced a decrease of BDNF expression in cortical and olfactory neurons.