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Related Concept Videos

Olfaction01:25

Olfaction

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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.
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Physiology of Smell and Olfactory Pathway01:20

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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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Diencephalon: Thalamus and Information Relay01:27

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Olfactory Receptors: Location and Structure01:03

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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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Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Anterior olfactory nucleus mediates parallel inter-bulbar pathways in rodents.

Li Wang1,2, Anan Li3, Sen Jin4

  • 1School of Medicine, Jingchu University of Technology, Jingmen, 448000, China.

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Summary

The anterior olfactory nucleus (AON) acts as a key hub for interhemispheric communication between olfactory bulbs (OBs) in mammals. It facilitates odor information transfer through distinct excitatory, inhibitory, and co-innervation pathways.

Keywords:
Anterior olfactory nucleusElectrophysiologyInterhemispheric communicationOlfactory bulbVirus tracing

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Mammalian Brain Circuits

Background:

  • Interhemispheric communication of olfactory information is vital for odor perception and localization in animals.
  • The structural basis for mammalian interhemispheric olfactory communication is not well understood.
  • Investigating neural circuits for olfactory bulb (OB) interhemispheric transmission is essential.

Purpose of the Study:

  • To systematically dissect the neural circuits underlying interhemispheric transmission between bilateral olfactory bulbs (OBs).
  • To identify the central structures and pathways involved in olfactory information exchange between the OBs.

Main Methods:

  • Electrophysiological recordings were employed to study neural activity.
  • Virus-mediated tracing techniques were used to map neural connections.
  • Systematic dissection of neural circuits involved in interhemispheric OB communication.

Main Results:

  • The anterior olfactory nucleus (AON) was identified as a central hub for OB interhemispheric communication.
  • Three distinct pathways were characterized: excitatory inter-bulbar, inhibitory inter-bulbar, and bi-bulbar co-innervation.
  • Differential roles of AON subregions (pars externa and pars principalis) in mediating these pathways were highlighted, involving CaMKIIα-positive neurons.

Conclusions:

  • This study provides novel anatomical insights into the neural circuits of interhemispheric olfactory communication.
  • The differential connectivity of AON subregions contributes to understanding bilateral olfactory information processing.
  • Elucidates how olfactory information is transferred between the two OBs via identified pathways.