The nose knows.

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Presentation transcript:

The nose knows

The nose: Sense of Smell Besides filtering, warming and humidifying air the nose’s other job is as an olfactory (smell) organ. The perception of odours is called olfaction The top of the nose is formed by 2 bones – nasal bones The tip of the nose is made of cartilage * Epithelium produces mucus in nasal cavities

The olfactory membrane (smell) is located in the top of the nasal cavity this area has over 12 million specialized nerve cells that detect odours called the olfactory bulb. The nose can detect about 10,000 different odours The information is sent directly to the olfactory area of the brain *

To smell something… Must be gaseous(volatile), transported by air Must be odoriferous, of a chemical nature that stimulates smell receptor cells. Must occur in sufficiently high concentrations to stimulate smell receptor cells. Must reach the receptor cells in the olfactory membrane (not blocked by mucus)

How we smell Odour molecules dissolve in the mucus in the nasal cavity (1) They touch the dendrites of the olfactory cells (2) located in the olfactory epithelium A nerve signal begins The olfactory cells pass the information to the olfactory nerve (3) Information is sent to the temporal lobe (4) FUN FACT: The sense of smell tends to deteriorate with age.

How we smell