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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: May 16, 2026

Perforated Patch-clamp Recording of Mouse Olfactory Sensory Neurons in Intact Neuroepithelium: Functional Analysis of Neurons Expressing an Identified Odorant Receptor
10:16

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Rapid odor perception in rat olfactory bulb by microelectrode array.

Jun Zhou1, Qi Dong, Liu-jing Zhuang

  • 1Biosensor National Special Lab, Key Lab for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China.

Journal of Zhejiang University. Science. B
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Mammals recognize odors within a single breath cycle by analyzing mitral/tufted (M/T) cell ensemble activity in the olfactory bulb. This rapid odor discrimination occurs through dynamic neural patterns, revealing olfactory processing speed.

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Area of Science:

  • Neuroscience
  • Olfactory System Research

Background:

  • The olfactory bulb processes odor information through mitral/tufted (M/T) cells.
  • Understanding the temporal dynamics of M/T cell responses is crucial for olfactory perception.

Purpose of the Study:

  • To investigate the temporal features of M/T cell responses to odor stimuli.
  • To determine if odor discrimination occurs within a single respiratory cycle.

Main Methods:

  • Recorded M/T cell activity in anesthetized rats using a microwire electrode array.
  • Applied saturated vapors of four distinct odorants (anisole, carvone, citral, isoamyl acetate).
  • Analyzed ensemble activity, firing rates, and population vectors, using principal component analysis for visualization.

Main Results:

  • M/T cell responses exhibited transient excitatory and inhibitory patterns within the first inhalation after odor onset.
  • Ensemble activity showed strong dynamic changes, with enlarged distances between cluster centers.
  • Odor-evoked patterns suggest odor recognition and discrimination within a short respiration cycle.

Conclusions:

  • Mammalian odor recognition and discrimination are completed rapidly, within the first breathing cycle.
  • The olfactory system effectively encodes odor information through dynamic ensemble activity of M/T cells.
  • These findings provide insights into the neural mechanisms of olfactory perception and odor discrimination.