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関連する概念動画

Nervous Tissue: Myelin01:25

Nervous Tissue: Myelin

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...
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Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Direct Motor Pathways01:11

Direct Motor Pathways

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and...
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Brainstem01:19

Brainstem

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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関連する実験動画

Updated: Jan 13, 2026

Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice
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運動技能を支える皮質回路機能におけるミエリンの役割

Kimberly Gagnon, Gustavo Della Flora Nunes, Dailey Nettles

    bioRxiv : the preprint server for biology
    |January 9, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    一次運動野（M1）におけるミエリンの喪失は、神経活動と同期を妨げることにより、技能運動を損なう。部分的な再髄鞘化の後でも、抑制性回路の機能不全が主要なメカニズムである。

    キーワード:
    ミエリン運動制御神経回路運動障害再髄鞘化

    さらに関連する動画

    Preparation and Immunostaining of Myelinating Organotypic Cerebellar Slice Cultures
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    関連する実験動画

    Last Updated: Jan 13, 2026

    Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice
    06:04

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    Preparation and Immunostaining of Myelinating Organotypic Cerebellar Slice Cultures
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    科学分野:

    • 神経科学
    • 運動制御
    • ミエリン生物学

    背景:

    • 一次運動野（M1）は技能運動に不可欠であり、高度に髄鞘化されている。
    • 多発性硬化症で見られるようなミエリン喪失は、運動障害を引き起こす。
    • 技能行動中のM1神経活動における髄鞘化の正確な役割は、完全には理解されていない。

    研究 の 目的:

    • ミエリンが、巧みなリーチング中のM1における神経活動と同期にどのように影響するかを調査すること。
    • ミエリン喪失と運動障害を結びつける細胞および回路メカニズムを特定すること。

    主な方法:

    • リーチング課題中のマウスにおける、オリゴデンドロサイトの生体内イメージングと高密度Neuropixels記録を組み合わせた。
    • कपrizoneを用いた脱髄誘発。
    • 実験データに制約された計算モデルを利用した。

    主要な成果:

    • कपrizone誘発脱髄は運動効率を低下させ、細胞種特異的な神経活動と同期を変化させた。
    • 抑制性軸索伝播不全を、ミエリン喪失と回路機能変化を結びつけるメカニズムとして特定した。
    • 部分的な再髄鞘化は、ネットワーク指標とリーチの一貫性を改善したが、滑らかな運動は改善せず、抑制性回路における選択的な脆弱性を示唆した。

    結論:

    • ミエリンは、技能運動行動に不可欠な皮質回路ダイナミクスをサポートするために重要である。
    • 抑制性回路はミエリン喪失に対して選択的な脆弱性を示し、運動制御に影響を与える。
    • これらの発見は、細胞レベルの脱髄モデルと臨床的な運動障害を結びつける。