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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...
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...
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...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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Related Experiment Video

Updated: Jul 6, 2026

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
10:42

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation

Published on: August 18, 2014

Bilateral olfaction: two is better than one for navigation.

Baranidharan Raman1, Iori Ito, Mark Stopfer

  • 1National Institute of Child Health and Human Development, NIH, Lincoln Drive, Bethesda, MD 20892, USA.

Genome Biology
|April 9, 2008
PubMed
Summary
This summary is machine-generated.

Fruit fly larvae can track odors using just one sensory neuron. However, using two sensory neurons improves the signal-to-noise ratio for better odor localization in difficult conditions.

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Visually Mediated Odor Tracking During Flight in Drosophila
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Visually Mediated Odor Tracking During Flight in Drosophila

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

Published on: June 5, 2017

Related Experiment Videos

Last Updated: Jul 6, 2026

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
10:42

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation

Published on: August 18, 2014

Visually Mediated Odor Tracking During Flight in Drosophila
08:50

Visually Mediated Odor Tracking During Flight in Drosophila

Published on: January 26, 2009

Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
06:32

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

Published on: June 5, 2017

Area of Science:

  • Neuroscience
  • Olfactory processing
  • Animal behavior

Background:

  • Understanding how animals process sensory information is crucial for neuroscience.
  • Bilateral sensory input is often assumed necessary for accurate environmental perception.
  • The olfactory system in many animals plays a key role in survival behaviors.

Purpose of the Study:

  • To investigate whether bilateral sensory input is essential for odor source localization in animals.
  • To determine the role of unilateral versus bilateral olfactory input in fruit fly larvae.
  • To examine the impact of signal-to-noise ratio on odor tracking abilities.

Main Methods:

  • Utilized genetic manipulations to create fruit fly larvae with unilateral or bilateral functional olfactory sensory neurons.
  • Observed and analyzed the odor-tracking behavior of fruit fly larvae in controlled laboratory settings.
  • Quantified the accuracy and efficiency of odor source localization under different experimental conditions.

Main Results:

  • Fruit fly larvae demonstrated the ability to localize odor sources effectively using input from a single functional sensory neuron (unilateral input).
  • Dual sensory neuron input (bilateral input) resulted in an enhanced signal-to-noise ratio.
  • The enhanced signal-to-noise ratio from bilateral input proved beneficial for odor localization in more challenging environments.

Conclusions:

  • Bilateral sensory input is not strictly required for basic odor source localization in fruit fly larvae.
  • Unilateral olfactory input is sufficient for detecting and tracking odors.
  • Dual olfactory inputs provide an advantage by improving signal detection and localization accuracy, particularly in noisy or complex environments.