The 500 human olfactory receptor genes are shadowed by about the same number of silent pseudogenes.

Alas, my nose apparently was shortchanged on olfactory receptor cells.

Here, some 500 types of olfactory receptor proteins bind different combinations of odorant molecules.

But our 500 intact, coding olfactory receptor genes are still enough to provide a good olfactory system.

At the glomerular layer, axons from the olfactory receptor neurons intermingle with dendrites from intrinsic olfactory bulb neurons: mitrial/tufted cells and dopaminergic periglomerular cells.

Yet despite the prominence of the olfactory sense in late nineteenth-century writing, no full-length study has examined perfume in the literature of the period until now.

Bees also are thought to rely on their olfactory sense to help locate the food source once the foragers are given directions from the dances.

Rodents have a sensitive olfactory sense which has been used by humans to detect odors or chemicals of interest.

Such a direct limbic connection makes the olfactory sense unique.

The head bears four tentacles; the upper two are larger and bear eye-like light sensors, and the lower two are tactile and olfactory sense organs.

It seems, then, that just as the visual system runs on a retinotopic map, the olfactory system runs on a chemotopic map.

For this reason, humans aren’t particularly aware of the richness of information that can be transmitted through the air, and can be perceived by a highly sensitive olfactory system.

But our 500 intact, coding olfactory receptor genes are still enough to provide a good olfactory system.

Receptor neurons and mitral cells located in the olfactory system adapt in response to odors.

The telencephalon forms from the dorsal parts of p6 and p5, where p6 becomes the olfactory system and p5 will coincide with the visual system.