狗 狗具有较大的嗅觉区(olfactory area)在脑部比人类多40倍相关嗅觉的脑细胞，狗狗的鼻头由奇特分泌细胞连结潮湿，气息以微粒呈视，会溶入鼻头液体，再带到感想细胞。
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olfactory y area 嗅觉区
For instance, Dorman notes that half of the nasal cavity of a rat is lined with olfactory-system cells. In humans, this receptive area is much smaller, he says - "only about 3 to 5 percent."
多尔曼指出，例如大鼠鼻腔有一半的面积附有嗅细胞，而对于人类来说，这种嗅觉接收区就小得多，他说——“也就鼻腔的3% - 5%吧。”
The projection of the ventral tegmental area (VTA) to the olfactory tubercle(OT) was studied with in 20 rats with retrograde axonal transport of hoseradish peroxidase(HRP).
应用HRP逆轴突传递法观察了20只大鼠腹侧被盖区向嗅结切的投射。
The ventral tegmental area is another source of centrifugal fibers to the olfactory bulb.
腹侧被盖区是嗅球传入纤维的另一来源。
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