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Related Experiment Video

Updated: Oct 2, 2025

The Olfactory System as a Model to Study Axonal Growth Patterns and Morphology In Vivo
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The Shape of the Olfactory Bulb Predicts Olfactory Function.

Xiaoguang Yan1, Akshita Joshi1, Yunpeng Zang1

  • 1Smell and Taste Clinic, Department of Otorhinolaryngology, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany.

Brain Sciences
|February 25, 2022
PubMed
Summary
This summary is machine-generated.

The shape of the olfactory bulb (OB) can predict olfactory function and is linked to olfactory loss. Non-convex OB shapes were more common in patients, suggesting OB shape is a biomarker for olfactory dysfunction.

Keywords:
MRIanosmiadeformationolfactionolfactory bulb shapeplasticitysmell

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Olfactory Research

Background:

  • The olfactory bulb (OB) is crucial for processing smell information.
  • OB volume correlates with olfactory function, offering diagnostic insights.
  • The diagnostic value of OB shape in olfactory dysfunction remains largely unexplored.

Purpose of the Study:

  • To classify human olfactory bulb (OB) shapes for clinical and research use.
  • To investigate the relationship between OB shape, olfactory function, age, and gender.
  • To determine if OB shape can serve as a biomarker for olfactory dysfunction.

Main Methods:

  • Manual delineation and characterization of OB shapes from high-resolution T2-weighted MRI scans.
  • Classification of OB shapes into convex and non-convex patterns based on contours.
  • Detailed olfactory function assessment using the extended "Sniffin’ Sticks" test.
  • Analysis of 192 patients with olfactory dysfunction and 77 healthy controls.

Main Results:

  • A robust classification system for OB shapes was developed with substantial inter-rater agreement (Cohen's Kappa = 0.73).
  • Non-convex OB shapes were significantly more prevalent in patients compared to healthy controls.
  • OB shape correlated with olfactory function independently of OB volume, age, and gender.
  • Irregular OB shape was notably associated with post-traumatic olfactory loss.

Conclusions:

  • Olfactory bulb (OB) shape is a potential biomarker for olfactory dysfunction.
  • OB shape classification offers a scalable tool for clinical and research applications.
  • OB shape analysis provides novel insights into the pathophysiology of olfactory disorders.