嗅觉是人体原始的感觉功能之一,人体的嗅区黏膜分布在鼻腔顶中部,向下至鼻中隔上部及鼻腔外侧壁等嗅裂区域。嗅觉具有辨别气味、增进食欲、识别环境及报警等作用,还可通过中枢神经系统影响人的情绪、调节生命周期。嗅觉的形成较为复杂,除嗅神经外,还有三叉神经、舌咽神经、迷走 Smell is one of the primitive sensory functions of the human body. Olfactory mucosa of the human body is distributed in the middle of the nasal cavity, down to the upper olfactory area of ​​the nasal septum and the outer olfactory wall of the nasal cavity. Smell has the function of distinguishing odor, increasing appetite, recognizing the environment and alarming, and can also affect people’s mood and regulate the life cycle through the central nervous system. The formation of the olfactory complex, in addition to olfactory nerve, there are trigeminal nerve, glossopharyngeal nerve, vagina