The nose is separated into 2 nostrils by a plate of cartilage called the septum. There are specialised cells in the roof of the nose
which are stimulated when chemical particles dissolve in the moist mucosal lining as we inhale. Nerve fibres travel from here
towards the special olfactory area of the temporal cortex of the brain where the impulses are interpreted and we become aware
of the smell.
If the smell is one we perceive as pleasant it may increase our appetite and so can play an important role in the digestive
process. Our ability to smell also influences our sense of taste as found when we have a cold! Our sense of smell is a primitive one
and would have been vital to our survival in the past just as it is for wild animals .It also links directly with the emotional part of
the brain and so can evoke powerful memories.
"These anatomy and physiology courses are fantastic. I wish all my university lectures 10 years ago had been available via e-learning. I would have remembered so much more"
- Cordelia Peacock -
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