The main reason is the complicated anatomic structure of the nasal cavity and the special physiological location of the olfactory region, which has caused much trouble in direct experiment studies.

这主要是由于鼻腔的复杂结构及嗅区的特殊生理位置，为直接的嗅觉实验研究带来了不少困难。

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In this review, we unraveled coding patterns of two olfactory systems for information recognition at three levels: olfactory receptor, olfactory bulb and higher brain region beyond the olfactory bulb.

本文从嗅觉感受器、嗅球、嗅球以上脑区三个水平综述了这两种嗅觉系统对化学信息识别的编码模式。

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Analysis of the brains of the euthanized rats revealed decreased levels of Fos, a protein marker of neuronal activity, in the amygdala region of the brain while the olfactory signals appeared to block fear responses.

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