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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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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

8.6K
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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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

7.6K
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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Neural Circuits01:25

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
918
Integration of Synaptic Events01:28

Integration of Synaptic Events

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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability...
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Updated: May 9, 2025

Author Spotlight: Exploring Glial Influence in Experience-Dependent Synaptic Pruning During Critical Periods
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Author Spotlight: Exploring Glial Influence in Experience-Dependent Synaptic Pruning During Critical Periods

Published on: March 1, 2024

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寸法縮小は,嗅覚回路でシナプスパートナーのマッチングを簡素化します.

Cheng Lyu1,2, Zhuoran Li1,2,3, Chuanyun Xu1,2,3

  • 1Department of Biology, Stanford University, Stanford, CA, USA.

Science (New York, N.Y.)
|May 1, 2025
PubMed
まとめ
この要約は機械生成です。

嗅覚受容体ニューロン (ORN) アクソンは,3D空間を1Dプロジェクションに簡素化することで,ハエのアンテナロブをナビゲートします. この発達原理は,特定の2次元軌道に沿って軸索を誘導し,正確なシナプスパートナーマッチングを保証します.

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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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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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関連する実験動画

Last Updated: May 9, 2025

Author Spotlight: Exploring Glial Influence in Experience-Dependent Synaptic Pruning During Critical Periods
07:13

Author Spotlight: Exploring Glial Influence in Experience-Dependent Synaptic Pruning During Critical Periods

Published on: March 1, 2024

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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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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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科学分野:

  • 神経科学
  • 発達生物学
  • コンピュータ生物学

背景:

  • 複雑な3D環境でのアクソン誘導は,神経発達中に重要な課題を提示します.
  • ニューラルマップの形成の原理を理解することは 脳の機能を解読するのに不可欠です

研究 の 目的:

  • フライのアンテナ葉の 3D グローメルマップの形成を制御する発達原理を明らかにする.
  • 嗅覚受容体ニューロン (ORN) のアクソンが正しいポストシナプスパートナーを見つける方法を調査する.

主な方法:

  • 発育中のハエのアンテナ葉の軸索軌道の分析
  • シナプスパートナー選択における特定の軸索経路の役割を調査する.
  • ニューラル・ワイヤリングの次元縮小を理解するために コンピューティング・モデリングを利用する.

主要な成果:

  • ORN軸突は,最終的な胞の位置に関係なく,先頭葉表面のデンドライトに最初に接触する.
  • 各 ORN タイプは2D 表面上で明確な弧状の軌道をたどります.
  • これらの軌道を変化させると 精密なシナプス配合が妨げられます

結論:

  • 3Dプロジェクションから1Dプロジェクションへのナビゲーションの複雑さを減らすことにより,3Dグローメルマップが確立されます.
  • 2次元表面に沿った軸索の軌道は,ポストシナプスパートナーの探求を簡素化します.
  • この原理はハエの脳内の 正確なニューラル配線のための 基本的メカニズムを提供します