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Henneman’s size principle describes relationships between properties of motor neurons and the muscle fibers they innervate and thus control, which together are called motor units. Motor neurons with large cell bodies tend to innervate fast-twitch, high-force, less fatigue-resistant muscle fibers, whereas motor neurons with small cell bodies tend to innervate slow-twitch, low-force, fatigue-resistant muscle fibers. In order to contract a particular muscle, motor neurons with small cell bodies are recruited (i.e. begin to fire action potentials) before motor neurons with large cell bodies. It was proposed by Elwood Henneman.

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  • Henneman’s size principle describes relationships between properties of motor neurons and the muscle fibers they innervate and thus control, which together are called motor units. Motor neurons with large cell bodies tend to innervate fast-twitch, high-force, less fatigue-resistant muscle fibers, whereas motor neurons with small cell bodies tend to innervate slow-twitch, low-force, fatigue-resistant muscle fibers. In order to contract a particular muscle, motor neurons with small cell bodies are recruited (i.e. begin to fire action potentials) before motor neurons with large cell bodies. It was proposed by Elwood Henneman. (en)
  • ヘネマンのサイズの原理は、運動ニューロンの特性と、その神経が支配しコントロールする筋線維(これらはまとめて運動単位と呼ばれる)との関係を示す。大きな細胞体を持つ運動ニューロンは、速く、強く、疲労しやすい筋線維を支配する傾向があるが、小さな細胞体を持つ運動ニューロンは、遅く、弱く、疲労しにくい筋線維を支配する傾向がある。ある筋肉が収縮する際、小さな細胞体を持つ運動ニューロンは、大きな細胞体を持つ運動ニューロンより前に動員される(つまり、活動電位が生じる。)。これはエルウッド・ヘネマンによって提案された。 (ja)
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  • Henneman’s size principle describes relationships between properties of motor neurons and the muscle fibers they innervate and thus control, which together are called motor units. Motor neurons with large cell bodies tend to innervate fast-twitch, high-force, less fatigue-resistant muscle fibers, whereas motor neurons with small cell bodies tend to innervate slow-twitch, low-force, fatigue-resistant muscle fibers. In order to contract a particular muscle, motor neurons with small cell bodies are recruited (i.e. begin to fire action potentials) before motor neurons with large cell bodies. It was proposed by Elwood Henneman. (en)
  • ヘネマンのサイズの原理は、運動ニューロンの特性と、その神経が支配しコントロールする筋線維(これらはまとめて運動単位と呼ばれる)との関係を示す。大きな細胞体を持つ運動ニューロンは、速く、強く、疲労しやすい筋線維を支配する傾向があるが、小さな細胞体を持つ運動ニューロンは、遅く、弱く、疲労しにくい筋線維を支配する傾向がある。ある筋肉が収縮する際、小さな細胞体を持つ運動ニューロンは、大きな細胞体を持つ運動ニューロンより前に動員される(つまり、活動電位が生じる。)。これはエルウッド・ヘネマンによって提案された。 (ja)
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  • Henneman's size principle (en)
  • サイズの原理 (ja)
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