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Updated: Jan 5, 2026
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The Olfactory System as a Model to Study Axonal Growth Patterns and Morphology In Vivo
Published on: October 30, 2014
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Anatomy of the olfactory system.
Timothy D Smith1, Kunwar P Bhatnagar2
1School of Physical Therapy, Slippery Rock University, Slippery Rock, PA, United States.
Handbook of Clinical Neurology
|October 13, 2019
Summary
The human olfactory system, though reduced compared to mammals, retains functional sensory neurons. These neurons regenerate and transmit scent information from the olfactory epithelium to the olfactory bulb for further processing.
Area of Science:
- Neuroscience
- Sensory Biology
- Anatomy
Background:
- Olfaction is a primary sensory system with ancient evolutionary roots.
- The olfactory system comprises peripheral (olfactory epithelium, nerve) and central (olfactory bulb) components.
- Humans possess a reduced olfactory system compared to many mammals, lacking a functional accessory olfactory system.
Purpose of the Study:
- To describe the general anatomy and microanatomy of the human olfactory system.
- To highlight key structural features and cellular components of human olfaction.
- To provide an overview of scent signal processing from the periphery to the central nervous system.
Main Methods:
- Descriptive anatomical and microanatomical review.
- Comparative analysis of human olfactory structures versus other mammals.
- Explanation of cellular elements and neural pathways involved in olfaction.
Main Results:
- The human olfactory system includes olfactory epithelium and olfactory bulb, with reduced turbinates and olfactory epithelia compared to many mammals.
- Despite reductions, humans possess a functional, regenerating population of olfactory sensory neurons.
- These neurons possess ciliary processes bearing odorant receptors and project axons to the olfactory bulb, where mitral and tufted cells relay information.
Conclusions:
- The human olfactory system, while architecturally simplified, retains essential functional components for scent detection and processing.
- Regenerating olfactory sensory neurons are crucial for continuous olfactory function.
- Understanding the anatomy of the human olfactory system is fundamental to comprehending olfactory perception and its disorders.
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