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Related Concept Videos

Olfaction01:25

Olfaction

45.3K
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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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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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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Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
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Depression: Overview01:18

Depression: Overview

399
Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
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Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

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Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
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Related Experiment Video

Updated: Sep 28, 2025

An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression
06:27

An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression

Published on: July 11, 2025

277

Olfactory Function and Depression: A Meta-Analysis.

Boo-Young Kim1, Jung Ho Bae1

  • 1Department of Otorhinolaryngology, School of Medicine, Ewha Womans University of Korea, Seoul, Korea.

Ear, Nose, & Throat Journal
|April 1, 2022
PubMed
Summary
This summary is machine-generated.

Depression is linked to significantly impaired olfactory function, as shown by standardized tests like the UPSIT-40. This suggests smell tests could aid in understanding and diagnosing depression.

Keywords:
Olfactiondepressionolfactory function testquestionnaire

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A Free-breathing fMRI Method to Study Human Olfactory Function
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A Free-breathing fMRI Method to Study Human Olfactory Function

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Olfactory Neurons Obtained through Nasal Biopsy Combined with Laser-Capture Microdissection: A Potential Approach to Study Treatment Response in Mental Disorders
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Olfactory Neurons Obtained through Nasal Biopsy Combined with Laser-Capture Microdissection: A Potential Approach to Study Treatment Response in Mental Disorders

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Related Experiment Videos

Last Updated: Sep 28, 2025

An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression
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An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression

Published on: July 11, 2025

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A Free-breathing fMRI Method to Study Human Olfactory Function
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Olfactory Neurons Obtained through Nasal Biopsy Combined with Laser-Capture Microdissection: A Potential Approach to Study Treatment Response in Mental Disorders
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Area of Science:

  • Rhinology
  • Neuroscience
  • Psychiatry

Background:

  • Olfactory dysfunction is increasingly recognized as a potential biomarker for various neurological and psychiatric conditions.
  • The intricate connection between the olfactory system, emotion, and memory warrants further investigation in the context of mood disorders.

Purpose of the Study:

  • To investigate the relationship between olfactory function and depression.
  • To suggest future research directions in rhinology concerning olfaction and depression.

Main Methods:

  • A systematic literature search was conducted across five major databases (PubMed, SCOPUS, Embase, Web of Science, Cochrane) for studies published from December 2019 to the present.
  • Findings from selected studies on olfactory function and depression were reviewed, utilizing depression questionnaires and standardized olfactory tests.

Main Results:

  • A meta-analysis revealed significantly lower olfactory function scores in individuals with depression compared to control groups.
  • Specific tests, including the UPSIT-40 and Sniffin' sticks, indicated poorer olfactory identification, discrimination, and threshold in the depression cohort.

Conclusions:

  • The study confirms a significant association between impaired olfactory function and depression.
  • Standardized olfactory testing presents a viable methodology for assessing and potentially diagnosing depression, highlighting the integration of olfactory processing with central emotional and memory pathways.