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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

Physiology of Smell and Olfactory Pathway

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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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Introduction to Special Senses01:26

Introduction to Special Senses

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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...
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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Related Experiment Video

Updated: Aug 18, 2025

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

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Olfactory coding.

George Barnum1, Elizabeth J Hong1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Current Biology : CB
|December 6, 2022
PubMed
Summary
This summary is machine-generated.

Olfaction, the sense of smell, is crucial for most organisms. Research suggests odor perception is organized in a lower-dimensional space, simplifying complex chemical 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
  • Sensory Biology
  • Chemosensation

Background:

  • Most life relies on chemical cues (olfaction) for survival and reproduction, unlike humans who prioritize sight and sound.
  • Olfactory stimulus space is complex, lacking obvious organizational axes compared to light or sound.
  • Understanding olfaction is challenging due to the intricate nature of odorant molecules and perception.

Purpose of the Study:

  • To investigate the organizational principles of olfactory perception.
  • To explore relationships between odorant physicochemical properties and human odor perception.
  • To understand how high-dimensional chemical information is transformed into low-dimensional perceptual space.

Main Methods:

  • Analysis of correlations between odor descriptors provided by human observers.
  • Examination of physicochemical characteristics of monomolecular odorants (e.g., carbon chain length, functional groups).
  • Investigating potential perceptual 'primaries' in odor organization.

Main Results:

  • Olfactory perceptual space appears to be a relatively low-dimensional structure.
  • Odor descriptors are often significantly correlated (e.g., 'woody' and 'warm').
  • Hedonic valence ('pleasantness') is a key dimension in odor perception.

Conclusions:

  • Olfactory perception simplifies complex chemical stimuli into a more manageable perceptual space.
  • Identifying the organizational axes of odor space is crucial for a comprehensive model of olfactory coding.
  • Further research is needed to fully elucidate the transformation from chemical to perceptual space in olfaction.