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Related Concept Videos

Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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

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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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Physiology of Smell and Olfactory Pathway01:20

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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.
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Taste Buds and Receptors01:20

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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Sensory Perception: Organization of the Somatosensory System01:11

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Related Experiment Video

Updated: Jun 28, 2025

A Free-breathing fMRI Method to Study Human Olfactory Function
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The relationship between survey-based subjective olfactory awareness and objective olfactory function.

Aurelia S Monk1, Shreyas Pyati1, Meredith Lamb1

  • 1Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

International Forum of Allergy & Rhinology
|April 15, 2024
PubMed
Summary
This summary is machine-generated.

Symptom surveys for smell loss show moderate agreement with objective tests. For accurate diagnosis and monitoring of olfactory dysfunction, symptom scales like the Odor Awareness Scale (OAS) and Affective Importance of Odor Scale (AIO) should correlate with objective measures.

Keywords:
UPSITolfactionolfactory disordersolfactory test

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Psychophysics

Background:

  • Olfactory dysfunction is a common symptom impacting quality of life.
  • Accurate assessment of smell dysfunction is crucial for diagnosis and management.
  • Symptom-based surveys are widely used but their correlation with objective measures needs evaluation.

Purpose of the Study:

  • To evaluate the correlation between subjective olfactory perception and objective olfactory function.
  • To assess the utility of the Odor Awareness Scale (OAS) and Affective Importance of Odor Scale (AIO) in relation to objective olfactory testing.

Main Methods:

  • Participants completed the Odor Awareness Scale (OAS) and Affective Importance of Odor Scale (AIO).
  • Objective olfactory function was assessed using the University of Pennsylvania Scent Identification Test (UPSIT).
  • Correlation analyses were performed between survey scores and UPSIT results.

Main Results:

  • A variable correlation was observed between symptom-based surveys and objective olfactory testing.
  • The Odor Awareness Scale (OAS) demonstrated a significant positive correlation with UPSIT scores.
  • The Affective Importance of Odor Scale (AIO) also showed a significant, moderate positive correlation with UPSIT scores.

Conclusions:

  • While symptom surveys can provide valuable insights, their correlation with objective olfactory testing is moderate.
  • For precise diagnosis and effective symptom monitoring in olfactory dysfunction, integrating subjective reports with objective testing is recommended.
  • The OAS and AIO scales show potential as supplementary tools for assessing olfactory awareness and importance in clinical practice.