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Physiology of Smell and Olfactory Pathway

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...

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Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...

Microtubules in Signaling

Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...

Olfaction

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Related Experiment Video

Updated: Jun 23, 2026

Whole Mount Labeling of Cilia in the Main Olfactory System of Mice

Whole Mount Labeling of Cilia in the Main Olfactory System of Mice

Published on: December 27, 2014

Olfactory cilia: linking sensory cilia function and human disease.

Paul M Jenkins¹, Dyke P McEwen, Jeffrey R Martens

¹Department of Pharmacology, University of Michigan, 1301 MSRB III, Ann Arbor, MI 48109-5632, USA.

Chemical Senses

|May 2, 2009

Summary

The olfactory system uses cilia on sensory neurons to detect smells. Problems with these cilia cause impaired smell and are linked to human ciliopathies.

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Last Updated: Jun 23, 2026

Whole Mount Labeling of Cilia in the Main Olfactory System of Mice

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Published on: December 27, 2014

Using Primary Neurosphere Cultures to Study Primary Cilia

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Published on: April 14, 2017

Artificial Intelligence Approaches to Assessing Primary Cilia

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Published on: May 1, 2021

Area of Science:

Neuroscience
Cell Biology

Background:

The olfactory system detects airborne stimuli via olfactory sensory neurons.
Cilia, microtubule-based organelles on sensory neurons, are crucial for olfactory function.
Proper protein localization within cilia is essential for smell detection.

Purpose of the Study:

To highlight the critical role of cilia in olfactory sensory neurons.
To connect olfactory dysfunction to ciliopathies.
To emphasize the importance of studying olfactory cilia for understanding sensory diseases.

Main Methods:

This study is a review of existing literature on olfactory cilia.
It synthesizes information on ciliary protein localization and function.
It discusses the link between ciliary dysfunction and human diseases.

Main Results:

Olfactory sensory neurons rely on cilia for odorant detection.
Mislocalization of ciliary proteins or loss of cilia impairs olfactory function.
Impaired olfactory function is a hallmark of ciliopathies.

Conclusions:

Understanding olfactory cilia mechanisms is vital for diagnosing and treating sensory perception diseases.
Further research into olfactory cilia will illuminate the pathogenesis of ciliopathies.
Cilia are key players in both sensory perception and human disease.