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 ...

Early research had suggested that each neuron expresses just one type of receptor, and that all the neurons expressing a particular receptor link to a dedicated olfactory nerve cluster (called a ...

The theory of odors hitherto accepted, has been, that invisible particles, emanating from bodies, and coming in contact with the olfactory nerves, produce the sensation of smell. Substances to be ...

the vestibulocochlear nerve for hearing and balance, and the olfactory nerve for smell. Difficulties with any of these may indicate a neurological problem. For the sense of smell, test tubes are ...