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Related Concept Videos

Olfaction01:25

Olfaction

44.5K
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.
The olfactory...
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
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Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Related Experiment Video

Updated: Jul 29, 2025

Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
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Generating parallel representations of position and identity in the olfactory system.

István Taisz1, Erika Donà1, Daniel Münch2

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

Cell
|May 26, 2023
PubMed
Summary

Fruit flies use distinct olfactory pathways to process male pheromones, separating concentration and positional cues. This allows for context-specific behaviors like mating and repulsion.

Keywords:
connectomicsneural circuitspheromonessensory physiologysexual dimorphismsocial behaviorstereo smell

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Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Area of Science:

  • Neuroscience
  • Olfactory Processing
  • Animal Behavior

Background:

  • In Drosophila, the male pheromone cis-vaccenyl acetate (cVA) elicits distinct behaviors in females (courtship) and males (repulsion).
  • Understanding the neural circuits processing cVA is crucial for deciphering olfactory-driven behaviors.

Purpose of the Study:

  • To investigate how Drosophila olfactory circuits segregate and process qualitative and positional information from cVA.
  • To identify neural populations and their connectivity involved in cVA perception and behavioral output.

Main Methods:

  • Electrophysiological recordings from olfactory neurons.
  • Analysis of projection neuron responses to varying cVA concentrations and inter-antennal differences.
  • Characterization of third-order olfactory neuron populations and their connectivity.

Main Results:

  • Separate neural streams process cVA concentration and angular position.
  • Inter-antennal cVA concentration differences, amplified by contralateral inhibition, encode male angular position.
  • Third-order neurons exhibit diverse response properties, including tonic responses, olfactory looming detection, and multisensory integration.

Conclusions:

  • Drosophila olfactory circuits employ parallel processing streams for cVA, analogous to mammalian visual systems.
  • Multisensory integration of cVA with taste information refines mating behaviors.
  • This segregated processing enables context-appropriate behavioral responses to olfactory cues.