Observation by scanning electron microscope: The olfactory vesicle changed their shape, ORNs decreased, the olfactory cilia and the microvillus of the supporting cells disappeared, accord with the observation of transmission electron microscope. 扫描电镜观察:可见细胞间隙增宽,嗅细胞减少,嗅泡变形,嗅纤毛脱落,临床病变程度越重,电镜改变越明显。