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霊長類の巧緻な手の動きは機能的に異なる運動前ニューロン系によって制御される

Tomohiko Takei1,2,3, Tomomichi Oya1,2,3,4,5, Kazuhiko Seki1,2,6

  • 1Department of Neurophysiology, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan.

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まとめ

霊長類の手の制御には、直接的な皮質運動ニューロン（CM）細胞と、運動前介在ニューロン（PreM-INs）を介した間接的な経路の両方が関与する。PreM-INsは筋シナジーを促進し、CM細胞は選択的な筋制御を提供し、安定性と柔軟性のバランスをとる。

キーワード:
霊長類手の動き運動制御皮質運動ニューロン運動前介在ニューロン

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科学分野:

  • 神経科学
  • 霊長類の運動制御
  • 進化的神経生物学

背景:

  • 巧緻な手の動きは霊長類にとって極めて重要である。
  • 伝統的に、直接的な皮質運動ニューロン（CM）経路は、微細運動制御の主要なものと考えられてきた。
  • 脊髄運動前介在ニューロン（PreM-INs）を含む間接的な皮質脊髄経路も重要な役割を果たしていることが示唆されている。

研究 の 目的:

  • 霊長類の手の筋活動の生成におけるPreM-INsとCM細胞の機能的役割を比較すること。
  • 進化的に古く新しい運動制御経路の別々の寄与を解明すること。

主な方法:

  • サルにおけるPreM-INsおよびCM細胞からの神経活動記録。
  • 精密把持タスクの実行。
  • 神経データの分解能解析。

主要な成果:

  • 運動前介在ニューロン（PreM-INs）は、より広範な筋促進を示し、シナジー的な共同収縮を促進した。
  • CM細胞は、より選択的な筋促進を提供し、個々の筋制御を可能にした。
  • 安定性と柔軟性のバランスをとる、異なる制御モード（シナジーベース vs. 個別ベース）が特定された。

結論:

  • 霊長類の巧緻な手の制御は、別々の運動前ニューロン系の統合から生じる。
  • この発見は、進化的に分岐した経路の協調的な役割を強調することにより、運動制御の理解を再定義する。
  • 神経科学；霊長類の運動制御；進化的神経生物学