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Related Concept Videos

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...
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...
Olfactory Receptors: Location and Structure01:03

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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Related Experiment Video

Updated: Jul 1, 2026

Identification of Olfactory Volatiles using Gas Chromatography-Multi-unit Recordings (GCMR) in the Insect Antennal Lobe
09:49

Identification of Olfactory Volatiles using Gas Chromatography-Multi-unit Recordings (GCMR) in the Insect Antennal Lobe

Published on: February 24, 2013

Comparing peripheral olfactory coding with host preference in the rhagoletis species complex.

Shannon B Olsson1, Charles E Linn, Jeffrey L Feder

  • 1Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Hans Knöll, Jena, Germany. solsson@ice.mpg.de

Chemical Senses
|September 16, 2008
PubMed
Summary
This summary is machine-generated.

Rhagoletis pomonella flies distinguish host fruit by smell. Peripheral chemoreception differences in hybrids did not directly correlate with olfactory behavior, suggesting complex genetic and neuronal underpinnings for host preference.

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Area of Science:

  • Insect olfaction
  • Behavioral genetics
  • Chemical ecology

Background:

  • Rhagoletis pomonella (apple maggot fly) populations exhibit host-specific adaptations to hawthorn, apple, and dogwood.
  • Peripheral chemoreception in flies may influence olfactory preferences, impacting host-switching and speciation.
  • Understanding these mechanisms is crucial for dissecting the genetic basis of olfactory behavior in recently diverged populations.

Purpose of the Study:

  • To investigate the relationship between peripheral chemoreception and olfactory behavior in Rhagoletis pomonella hybrids.
  • To determine if changes in olfactory receptor specificity or sensitivity correlate with host preference in F(2) and backcross generations.
  • To explore the neurogenetic basis of olfactory behavior in sympatric fly populations.

Main Methods:

  • Flight tunnel experiments to assess olfactory-driven host preference.
  • Single sensillum electrophysiology to analyze peripheral chemosensory responses.
  • Hybrid crosses (F(2) and backcross) to examine genetic contributions to olfactory traits.

Main Results:

  • Peripheral chemoreception differences in second-generation hybrids did not directly correlate with observed olfactory behavior.
  • Electrophysiological responses showed variability but lacked a clear link to behavioral phenotypes.
  • Behavioral plasticity or subtle peripheral effects may explain the lack of direct correlation.

Conclusions:

  • The genetic and neuronal basis for olfactory behavior in Rhagoletis is complex, even in recently diverged populations.
  • Central nervous system plasticity may compensate for alterations in peripheral olfactory coding.
  • Current methods may not fully capture the subtle impacts of peripheral changes on fly behavior and host preference.