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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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 Structure01:03

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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...
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Olfaction01:25

Olfaction

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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.
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Related Experiment Video

Updated: Aug 19, 2025

A Free-breathing fMRI Method to Study Human Olfactory Function
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Correlation analysis of flow parameters in the olfactory cleft and olfactory function.

Shuo Wu1, Peiji Wang2, Dielai Xie3

  • 1E.N.T. Department, The 3rd Affiliated Hospital, Sun Yat-Sen University, Guangzhou, People's Republic of China. wush68@sysu.edu.cn.

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Summary
This summary is machine-generated.

Airflow in the olfactory cleft significantly impacts smell function. Higher airflow, velocity, and ratio in the olfactory cleft correlate with better olfactory function in adults.

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Area of Science:

  • Biomedical Engineering
  • Rhinology
  • Sensory Science

Background:

  • Olfaction relies on airflow within the olfactory cleft.
  • Limited research exists on the link between olfactory cleft airflow dynamics and olfactory function.

Purpose of the Study:

  • To investigate the correlation between airflow parameters and olfactory function.
  • To explore the relationship in healthy adults using computational fluid dynamics.

Main Methods:

  • 3D reconstruction of olfactory cleft anatomy from CT scans of 32 volunteers.
  • Olfactory function assessment using the Sniffin' Sticks test.
  • Computational fluid dynamics (CFD) analysis of airflow parameters.

Main Results:

  • Airflow, airflow velocity, and airflow ratio showed a strong positive correlation with olfactory function.
  • Mean pressure was not correlated with olfactory function.
  • Strongest correlation observed between overall airflow and olfactory function.

Conclusions:

  • Airflow dynamics within the olfactory cleft are crucial for olfactory function.
  • Specific regions like the posterior olfactory cleft and superior turbinate show important correlations.
  • CFD analysis provides valuable insights into the relationship between nasal airflow and smell.