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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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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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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.
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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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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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Updated: Oct 5, 2025

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Redundant neural circuits regulate olfactory integration.

Wenxing Yang1,2, Taihong Wu1, Shasha Tu2

  • 1Department of Organismic and Evolutionary Biology, Center for Brain Science, Harvard University, Cambridge, Massachusetts, United States of America.

Plos Genetics
|January 31, 2022
PubMed
Summary
This summary is machine-generated.

In C. elegans, a repulsive odorant (2-nonanone) blocks attraction to food odors. Genes like osm-5 and osm-1 are crucial for this olfactory integration, involving specific sensory neurons and interneurons.

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Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Behavioral genetics

Background:

  • Olfactory integration is vital for survival, enabling organisms to navigate complex environments.
  • Simultaneous processing of multiple odorant signals by the nervous system remains poorly understood.
  • Understanding how attractive and repulsive cues are integrated informs sensory processing mechanisms.

Purpose of the Study:

  • To elucidate the neural circuit basis of olfactory integration in Caenorhabditis elegans.
  • To investigate how repulsive odorants modulate responses to attractive odorants.
  • To identify genetic and cellular components involved in processing mixed odorant signals.

Main Methods:

  • Forward genetic screen to identify genes involved in olfactory integration.
  • Behavioral assays in C. elegans to assess responses to single and mixed odorants (2-nonanone, isoamyl alcohol, benzaldehyde).
  • Genetic manipulation and rescue experiments targeting sensory neurons (AWB, ASH) and interneurons (AVA, AIB, RIM).

Main Results:

  • The repulsive odorant 2-nonanone strongly inhibits attraction to food odorants like isoamyl alcohol (IAA).
  • Mutations in osm-5 and osm-1 disrupt this integration effect, affecting responses to 2-nonanone.
  • Restoring OSM-5 function in AWB or ASH sensory neurons rescues the integration defect.
  • Specific sensory neurons and interneurons process mixed odorant signals, contributing to the integration.

Conclusions:

  • Redundant neural circuits mediate the robust inhibition of attractive odorant responses by repulsive cues.
  • The study reveals the neuronal and cellular mechanisms underlying complex olfactory integration in C. elegans.
  • Genetic factors regulating sensory neuron function are critical for integrating conflicting olfactory information.