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関連する概念動画

The Neuromuscular Junction01:19

The Neuromuscular Junction

11.4K
The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
11.4K
Spinal Cord: Information Processing01:10

Spinal Cord: Information Processing

1.7K
The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
1.7K
Motor Unit Stimulation01:20

Motor Unit Stimulation

1.9K
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
1.9K
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

3.6K
The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
3.6K
Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

5.6K
Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
5.6K
Functions of the Nervous System01:18

Functions of the Nervous System

4.8K
The nervous system is responsible for coordinating and regulating the body's functions. It functions through three main processes: sensory, integrative, and motor processes. Sensory function involves the detection and transmission of information about internal and external stimuli from sensory receptors to the CNS. The CNS processes this information through an integrative function, where it interprets and makes decisions based on the incoming sensory information. Finally, the motor function...
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関連する実験動画

Updated: Sep 10, 2025

Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
13:07

Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo

Published on: December 5, 2012

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運動ニューロンの活動を解読するスパスティック筋肉で共有される明確な神経情報

Tian Xie, Chuyao Jian, Yujian Lei

    IEEE transactions on bio-medical engineering
    |August 26, 2025
    PubMed
    まとめ

    脳卒中後 脊髄運動ニューロンは 強制的な神経情報と 任意の神経情報を 異なる方法で処理します 脳からの情報より 脊髄の情報に 依存しているので 情報の流れがバランスがとれないのです

    科学分野:

    • 神経科学
    • モーター コントロール
    • リハビリテーション科学

    背景:

    • 脳卒中では 意志的・非意志的運動を制御する 神経経経路に障害が生じます
    • 脳卒中後の神経情報を 脊髄運動ニューロンがどう処理するかを理解することは 回復に不可欠です
    • 以前の研究では,脳卒中を生き延びた患者の非自発的な対自発的な活性化中の神経情報処理の違いを完全に解明できませんでした.

    研究 の 目的:

    • 脳卒中後の非自発的および自発的な筋肉活性化中に脊髄運動ニューロンが同一のニューラル情報を受信し,送信するかどうかを調査する.
    • 脳卒中の生存者における非自発的な収縮と自発的な収縮の間のモーターユニット (MU) 活動と共通シナプス入力 (CSI) を比較する.

    主な方法:

    • 14人の脳卒中生存者と10人の対照群で,高密度表面電動筋撮影 (HD- sEMG) を記録した.
    • パッシブなストレッチ (非自発的) とアクティブな収縮 (自発的) のタスクを実行した.
    • モーターユニット (MU) の放電率,変動性,およびモーターユニットアクションポテンシャル (MUAP) の分布は分解アルゴリズムを使用して分析された.
    • 交差相関分析は,モトニューロンへの共通シナプス入力 (CSI) を定量化した.

    主要な成果:

    • 脳卒中の生存者において,非自発的な活性化は,自発的な活性化と比較して,より高いMU放出率と,より低い放出変動を示した.

    さらに関連する動画

    The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation
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    The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation

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    In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
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    In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation

    Published on: May 11, 2020

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    関連する実験動画

    Last Updated: Sep 10, 2025

    Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
    13:07

    Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo

    Published on: December 5, 2012

    14.8K
    The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation
    09:10

    The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation

    Published on: October 13, 2016

    9.7K
    In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
    11:07

    In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation

    Published on: May 11, 2020

    5.4K
  • 非自発的および自発的なアクティベーションの間には,異なる運動ユニットアクションポテンシャル (MUAP) の分布パターンが観察されました.
  • コモン・シナプス・インプット (CSI) は,非自発的な活性化よりも低いもので,放出の変動性はCSIと正に相関していた.

    • 結論:

    • 脊髄運動ニューロンによる 神経情報の処理は,脳卒中後の非自発的および自発的な筋肉の活性化によって大きく異なります.
    • 脳卒中後の 脊髄と脊髄の間の 情報の流れがバランスがとれていないことが 示唆されています
    • 反射活動中の運動ユニットの放電は,脳からの下降命令よりも,脊髄運動ニューロンの内在的な性質によってより影響を受けるようです.