Source: D4K: “Five Senses"
Visit the D4K companion Web site to learn more about Smell: D4K: “Five Senses"
This short video segment from IdahoPTV's D4K illustrates the path a scent particle takes from the nose to the brain.
Download and ShareCHILD: The sense of smell is probably our oldest sense.
JOAN CARTAN-HANSEN: Tiny particles too small to be seen with your eyes float into your nose when you breathe. They drift to the top end of your nasal cavity. Inside your nose are two small areas called the olfactory epithelium. These are about the size of your thumbnail but they contain about 20 million olfactory cells with tiny hairs or cilia. Those scent particles stick to the cilia and trigger nerve cells. Those nerve cells send a message to the brain which identifies the scent.
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