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Related Concept Videos

Olfactory Receptors: Location and Structure01:03

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...
Olfaction01:25

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...
Physiology of Smell and Olfactory Pathway01:20

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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Related Experiment Video

Updated: Jun 13, 2026

Olfactory Assays for Mouse Models of Neurodegenerative Disease
07:27

Olfactory Assays for Mouse Models of Neurodegenerative Disease

Published on: August 25, 2014

Prognostic factors of olfactory dysfunction.

Thomas Hummel1, Jörn Lötsch

  • 1Interdisciplinary Center for Smell and Taste, Department of Otorhinolaryngology, University of Dresden Medical School, Germany. thummel@mail.zih.tu-dresden.de

Archives of Otolaryngology--Head & Neck Surgery
|April 21, 2010
PubMed
Summary
This summary is machine-generated.

Olfactory dysfunction prognosis improves with higher initial smell scores, younger age, and not smoking. Females and those with residual function are more likely to regain normal smell.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Medical Prognostics

Background:

  • Olfactory dysfunction significantly impacts quality of life.
  • Understanding prognostic factors is crucial for patient counseling and management.
  • Previous studies have explored various contributing factors with varying conclusions.

Purpose of the Study:

  • To identify key predictors of olfactory function recovery in patients with olfactory dysfunction.
  • To inform appropriate counseling strategies for individuals experiencing smell loss.

Main Methods:

  • Retrospective analysis of 894 patients (aged 11-84) reporting to an Interdisciplinary Center for Smell and Taste.
  • Evaluation of olfactory performance, duration of loss, presence of parosmia/phantosmia, origin of loss, age, sex, and smoking habits.
  • Comparison of olfactory function at two assessment points.

Main Results:

  • A significant improvement in olfactory function was observed between the first and second assessments (P < .001).
  • Higher initial olfactory scores, younger age, and non-smoking status positively correlated with improved smell function.
  • Females and patients with higher residual olfactory function were more likely to regain normosmia.

Conclusions:

  • Prognosis of olfactory dysfunction is primarily influenced by residual function, sex, parosmia, smoking habits, and age.
  • The origin of olfactory loss plays a secondary role, often reflected in initial olfactory performance.
  • Initial presence of parosmia may indicate a lower likelihood of complete anosmia recovery.