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Related Concept Videos

Olfaction01:25

Olfaction

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...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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Related Experiment Video

Updated: Jun 20, 2026

Whole Mount Immunolabeling of Olfactory Receptor Neurons in the Drosophila Antenna
05:21

Whole Mount Immunolabeling of Olfactory Receptor Neurons in the Drosophila Antenna

Published on: May 4, 2014

Olfactory information processing in Drosophila.

Nicolas Y Masse1, Glenn C Turner, Gregory S X E Jefferis

  • 1Division of Neurobiology, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK.

Current Biology : CB
|August 27, 2009
PubMed
Summary
This summary is machine-generated.

This review explores olfactory information processing in Drosophila, detailing how sensory input transforms through neural circuits to guide behavior. Key computations like signal averaging and gain control are mapped to specific circuit elements.

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Last Updated: Jun 20, 2026

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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Insect neurobiology

Background:

  • The olfactory system, crucial for behavior, features a conserved two-synapse pathway from periphery to brain in insects and vertebrates.
  • The Drosophila melanogaster olfactory system serves as a powerful model due to its anatomical similarities with vertebrate systems.
  • Recent advancements in molecular genetics, electrophysiology, and optical imaging have significantly improved our understanding of olfactory information flow.

Purpose of the Study:

  • To review the processing and transformation of olfactory information in Drosophila.
  • To elucidate the neural pathways from olfactory receptor neurons to higher olfactory centers.
  • To map elementary computational principles onto specific neural circuit elements.

Main Methods:

  • Molecular genetic techniques
  • Electrophysiological recordings
  • Optical imaging

Main Results:

  • Detailed anatomical and mechanistic insights into neural activity transformation.
  • Identification of circuit elements responsible for specific computations.
  • Emerging understanding of how computations like signal averaging, gain control, decorrelation, and integration are implemented.

Conclusions:

  • The Drosophila olfactory system provides a tractable model for understanding fundamental principles of sensory processing.
  • Specific neural circuits perform elementary computations essential for extracting behaviorally relevant olfactory information.
  • This research highlights the intricate mapping of computational functions onto neural architecture.