Odor are the effect of volatile molecules that float through the air , rushing through our nosttrils as we inhale. There are three stages in the process of smelling. Fragrance begins with the reception of odor molecules, which as they are inhaled, bind to the olfactory epithelium ( receptor cells that contain, in all, some 20 million nerve ending ). Odor transmission occurs when a message is fired to the right and left olfactory bulbs, located above and behind the nose at the base of the brain, each about the size and shape of the small Lima bean. At this point a variety of cells and neurons interpret, amplify and transmit the message to the limbic system.
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