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Odors, good or bad, vary vastly from person to person. It is our own perception that governs our sense of smell in the most basic of terms. A more technical overview of our fundamental knowledge of aroma is mediated by the olfactory nerve.
The olfactory receptor (OR) cells are neurons present in the olfactory epithelium, a small patch of tissue in back of the nasal cavity. There are millions of olfactory receptor neurons that act as sensory signaling cells. Each neuron has cilia in direct contact with air. The olfactory nerve is considered the smell mediator; the axon connects the brain to the external air. Odorous molecules act as a chemical stimulus. Molecules bind to receptor proteins extended from cilia, initiating an electric signal.