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Olfactory Receptors: Location and Structure

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...

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A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease

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Olfactory vector hypothesis for encephalitis lethargica.

¹Faculty of Health and Nutrition, Shubun University, Ichinomiya, Aichi 491-0938, Japan.

Medical Hypotheses

|June 3, 2017

Summary

This summary is machine-generated.

An airborne virus may cause encephalitis lethargica by infecting the olfactory bulb. This hypothesis explains the disease's hallmark wakeful inactivity and postencephalitic parkinsonism.

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Area of Science:

Neurology
Virology
Neuroscience

Background:

Classical encephalitis lethargica (CEL), described in 1917, has long been suspected to involve viral pathogenesis.
The precise mechanisms underlying CEL's characteristic symptoms, including wakeful inactivity and postencephalitic parkinsonism, remain incompletely understood.

Purpose of the Study:

To propose a novel hypothesis for the pathogenesis of classical encephalitis lethargica.
To elucidate the potential viral pathway and affected neural structures in CEL.
To explain the development of postencephalitic parkinsonism within this framework.

Main Methods:

Hypothetical model based on existing literature and recent discoveries.
Focus on the olfactory pathway as a route of viral entry.
Examination of neuroanatomical connections, specifically nigro-olfactory projections.

Main Results:

Proposes an airborne virus travels via the olfactory conduit to infect the olfactory bulb.
Suggests local infection or neuroinflammation retrogradely affects hypothalamic and midbrain sleep-wake regulatory neurons.
Links the olfactory vector hypothesis to postencephalitic parkinsonism via nigro-olfactory projections.

Conclusions:

The olfactory vector hypothesis offers a unifying explanation for CEL's primary symptoms and a major complication.
This model highlights the olfactory bulb as a potential initial site of infection and neuroinflammation.
Further research into olfactory system involvement in CEL is warranted.