Odours are first captured by special olfactory nerve cells inside your nose. These cells extend upwards from the roof of your nose towards the smell-processing centre of your brain, called the ...

There is evidence that the sense of smell is based on the geometry of molecules. Seven primary odors are distinguished, each of them by an appropriately shaped receptor at the olfactory nerve endings ...

Humans have two olfactory bulbs, one above each nasal cavity which connects the olfactory bulb and the nasal cavity is the olfactory nerve ... range in size from 1 to 1,000 nanometers.