Smelling: It's More Than Meets the Olfactory Epithelium

Olfactory: It is not only chemical samples that are compatible with the olfactory epithelial cell collection environment, and the ability to interpret samples has long been a life-sustaining technique of the Earth. We do not tend to look at the odor as a mechanism for analyzing physical specimens. Given some bad substances that we must smell every day, this is a bad idea. However, since you can not feel the book without touching it, you can not smell orange unless you lead an orange molecule.

Our sense of smell works by perceiving the smell. The olfactory epithelium in the nose contains millions of chemical receptors to detect odors. When it smells, chemical substances in the air blend into mucus. Odor substances in the olfactory epithelium Receptor neurons detect these smells and signal the olfactory bulb. These signals are then transmitted along the olfactory beam to the olfactory cortex of the brain. The olfactory cortex is essential for odor treatment and perception. It is located in the temporal lobe of the brain and participates in sensory input of the tissue. The olfactory cortex is also an integral part of the limbic system. This system involves handling our emotions, survival instincts and memory formation.

First let's see how we smell something. The scent is due to the invasion of molecules of certain substances into your nose. These odorous molecules are in contact with tissues called the olfactory epithelium including olfactory receptor cells fixed to these odor molecules (Figure 1). It produces electrical signals that are passed to clusters of nerve cells called glomeruli. Then, specialized neurons called mitral valve cells send these signals to the brain area.

Like taste, the sensation of smell and smell reacts to chemical stimuli. Olfactory receptor neurons are located in small areas within the upper nasal cavity (Figure 3). This region is called the olfactory epithelium and contains bipolar sensory neurons. Each olfactory neuron has a recess extending from the upper surface of the epithelium to the mucus within the lumen. When molecules in the air are inhaled through the nose, they pass through the olfactory epithelium and dissolve into mucus. These odor molecules bind to proteins, allow them to dissolve in mucus, and help transport them to olfactory dendrites. The odor-protein complex binds to the receptor protein of olfactory dendritic cell membranes. These receptors are G protein-coupled and will produce stepwise membrane potentials in olfactory neurons.