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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.
The olfactory receptors are embedded in the cilia of the...
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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.
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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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Related Experiment Video

Updated: Nov 20, 2025

Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization
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Odor processing in the cockroach antennal lobe-the network components.

Debora Fuscà1, Peter Kloppenburg2

  • 1Biocenter, Institute for Zoology, and Cologne Excellence Cluster On Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Zülpicher Str. 47b, 50674, Cologne, Germany.

Cell and Tissue Research
|January 24, 2021
PubMed
Summary
This summary is machine-generated.

This review details the functional properties of local interneurons and projection neurons in the insect antennal lobe. It highlights how these neuron types in the cockroach Periplaneta americana are crucial for olfactory signal processing.

Keywords:
Antennal lobeLocal interneuronsOlfactionPeriplaneta americanaProjection neurons

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Area of Science:

  • Neuroscience
  • Insect olfaction
  • Cellular neurophysiology

Background:

  • The central nervous system utilizes interconnected neural networks for olfactory signal processing.
  • In insects, the antennal lobe is the primary site for processing olfactory input from the antennae.
  • Local interneurons and projection neurons are key neuronal types within the antennal lobe, each with distinct physiological roles.

Purpose of the Study:

  • To review the cell type-specific functional properties of projection neurons and local interneurons in the antennal lobe.
  • To provide an overview of the biophysical and cellular bases of neuronal function in insect olfaction.
  • To highlight the significance of the cockroach Periplaneta americana as a model system for studying olfactory processing.

Main Methods:

  • Review of existing literature on antennal lobe neurophysiology.
  • Analysis of cell type-specific functional properties of insect neurons.
  • Focus on biophysical and cellular mechanisms in Periplaneta americana.

Main Results:

  • Detailed description of the specialized functional phenotypes of local interneurons and projection neurons.
  • Elucidation of the distinct physiological tasks performed by these neuron types during olfactory processing.
  • Identification of key biophysical and cellular properties underlying neuronal function in the antennal lobe.

Conclusions:

  • The antennal lobe of Periplaneta americana serves as a valuable model for understanding fundamental principles of olfactory processing.
  • Specialized functional properties of local interneurons and projection neurons are essential for efficient olfactory signal transduction.
  • Further research into these neuronal types can reveal broader insights into neural network function and sensory processing.