It is easy to overlook the importance of the sense of smell. Smell affects human health and safety. The sense of smell plays an essential role in the taste of food. It can also warn us of spoiled or unsafe food by its rancid odor. Smell can give pleasure, as with the fragrance of flowers, or make us nauseated, as when we smell a foul odor. Fragrances can bring back pleasant memories. The loss of smell can cause depression. With those things in mind, researchers are creating a smell map.
Maps of the receptors for vision, hearing, and touch have been developed previously, but this research was the first to create a detailed map of the receptors for smell. The research began by studying the smell receptors in mice. The challenge in creating a smell map is that it is more complex than the other senses. There are only three main receptor types needed for color vision, but mice have 20 million olfactory neurons and more than 1,000 types of odor receptors that detect unique subsets of odor molecules.
Before creating a smell map, the prevailing theory was that the smell receptors were randomly placed. The study showed that smell receptors form horizontal stripes from the top of the nose to the bottom, and the order matches the brain’s olfactory bulb. Further study will explore human olfactory receptors to compare them with those in mice.
This research is important because it will help scientists develop therapies for people who have lost their sense of smell, as has sometimes been the case with COVID-19. As we learn more about how the sense of smell works, we see evidence of design. The bottom line is that we are “fearfully and wonderfully made” (Psalms 139:14). The design of life, and especially the human body, shows evidence of a Designer, not random chance.
— Roland Earnst © 2026
Reference: Harvard Medical School hms.harvard.edu
