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Related Concept Videos

Olfaction01:25

Olfaction

44.3K
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

9.2K
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: Jun 24, 2025

An Explant System for Time-Lapse Imaging Studies of Olfactory Circuit Assembly in Drosophila
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An Explant System for Time-Lapse Imaging Studies of Olfactory Circuit Assembly in Drosophila

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Shaping the olfactory map: cell type-specific activity patterns guide circuit formation.

Ai Nakashima1, Haruki Takeuchi2

  • 1Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.

Frontiers in Neural Circuits
|June 11, 2024
PubMed
Summary
This summary is machine-generated.

Neural activity patterns, not just synchronous firing, shape brain sensory maps. Spontaneous, cell-specific timing in the olfactory system provides new insights into neural circuit development.

Keywords:
gene expressionneural activityneural developmentodorant receptorolfactory map

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Sensory Systems

Background:

  • The brain forms organized sensory maps to process information.
  • Traditionally, synchronous neuronal activity was believed to be key for sensory map formation.

Purpose of the Study:

  • To review recent findings on the role of spontaneous neural activity in sensory map development.
  • To challenge traditional views on sensory map formation.
  • To highlight the importance of spatiotemporal dynamics in neural circuit development.

Main Methods:

  • Review of existing literature on neural activity and sensory map formation.
  • Focus on evidence from the olfactory system.
  • Analysis of cell type-specific temporal patterns of spontaneous activity.

Main Results:

  • Recent evidence suggests cell type-specific temporal patterns of spontaneous activity are instructive in shaping the olfactory glomerular map.
  • This challenges the traditional view that only synchronous activity is important.
  • Spatiotemporal dynamics of neural activity are crucial for understanding neural circuit development.

Conclusions:

  • Spontaneous neural activity patterns play a critical role in sensory map development.
  • Future research should focus on the spatiotemporal dynamics of neural activity.
  • Understanding these dynamics is essential for comprehending complex neural circuit formation.