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関連する概念動画

Long-term Potentiation01:35

Long-term Potentiation

59.8K
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Synaptic Signaling01:09

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
7.2K
Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

15.3K
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
4.3K
Long-term Potentiation01:25

Long-term Potentiation

4.0K
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
4.0K
Integration of Synaptic Events01:28

Integration of Synaptic Events

6.5K
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 to...
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関連する実験動画

Updated: Apr 18, 2026

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
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デンドリット状の棘によるシナプス増幅は,入力協力性を高めます.

Mark T Harnett1, Judit K Makara, Nelson Spruston

  • 1HHMI Janelia Farm Research Campus, Ashburn, Virginia 20147, USA.

Nature
|October 30, 2012
PubMed
まとめ
この要約は機械生成です。

dendritic spinesは,重要な電気コンパートメントとして機能し,シナプス入力を大幅に増幅します. この増幅は,コアクティブ入力間の相互作用を促進することによって,ニューロンの計算能力と可塑性を高めます.

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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
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3D Modeling of Dendritic Spines with Synaptic Plasticity
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3D Modeling of Dendritic Spines with Synaptic Plasticity

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関連する実験動画

Last Updated: Apr 18, 2026

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
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Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices

Published on: March 15, 2018

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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
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3D Modeling of Dendritic Spines with Synaptic Plasticity
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3D Modeling of Dendritic Spines with Synaptic Plasticity

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科学分野:

  • 神経科学は神経科学である.
  • 計算神経科学とは
  • 細胞電気生理学 細胞電気生理学

背景:

  • dendritic spinesは,ニューロンの刺激性シナプス入力の主なサイトです.
  • 脊椎は,シナプス機能を調節する変更可能な化学的および電気的区画として機能することを理論的に提案されています.
  • 実験的証拠は,活動に依存する構造的および生化学的分割を支えるが,それらの電気的役割は議論の余地がある.

研究 の 目的:

  • シナプス伝達とニューロンの信号伝達に対するデンドリット脊椎の電気的影響を調査する.
  • 脊椎頸部抵抗とシナプス脱極化への影響を定量化するために.
  • 脊椎の電気的性質がニューロンの統合と計算にどのように影響するかを決定する.

主な方法:

  • ネズミのヒポキャンパスのCA1ピラミッドニューロンにおける脊髄頭と親のデンドライトの間の電圧幅比の測定.
  • 測定された電圧比とデンドリット阻力に基づいて,脊椎頸部抵抗 (R ((neck)) の計算.
  • 脊椎の電気的行動をシミュレートするために,形態学的に現実的なコンパートメントモデルの開発と利用.

主要な成果:

  • 脊椎頸部抵抗 (R ((neck)) は相当 (~500 MΩ) であることが判明しました.
  • この高いR (ネック) は,単一シナプス入力からの脊髄頭部脱極化の (1.5〜45倍) の有意な増幅につながります.
  • 棘は, dendritic arbor を横断して高インペデンス入力構造を作り, R (ネック) 依存の伝導活性化を介してコアクティブ入力間の電気相互作用を促進します.

結論:

  • dendritic spinesの電気的性質,特にその高い首の抵抗は,シナプス入力を増幅するために重要です.
  • 脊髄媒介増幅は非線形 dendritic 統合を強化し,活動依存の可塑性を促進します.
  • これらの電気的機能は,基本的にニューロンの計算能力を高めます.