The sense of smell is picked up in the olfactory areas of the NOSE. Each of these is about 3 square centimetres and contains 50 million olfactory, or smelling, cells. They are situated, one on either side, at the highest part of each nasal cavity. This is why we have to sniff if we want to smell anything carefully, as in ordinary quiet breathing only a few eddies of the air we breathe reaches an olfactory area. From these olfactory cells the olfactory nerves (one on each side) run up to the olfactory bulbs underneath the frontal lobe of the BRAIN, and here the impulse is translated into what we describe as smell.