…It is a type of astrocyte that extends several dendrites from the cell body. There are two types of motor neurons: large alpha motor neurons and small gamma motor neurons. The alpha type gives off alpha motor fibers with a diameter of 8 to 13 μm, and the gamma type gives off gamma motor fibers with a diameter of 3 to 8 μm. Signals from the alpha motor fibers cause muscle contraction, and the gamma motor fibers send signals to tension receptors called muscle spindles in the muscle, which then control specialized muscle fibers called intrinsic muscles. … *Some of the terminology that mentions "gamma motor neuron" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…細胞体から数本の樹状突起をのばす,いわゆる星状細胞の一種である。大型のα運動ニューロンと小型のγ運動ニューロンの2型があり,α型からは直径8~13μのα運動繊維が,γ型からは3~8μのγ運動繊維が出る。α運動繊維の信号は筋肉の収縮をおこし,γ運動繊維は筋肉内にある筋紡錘と呼ばれる張力受容器に送られ,そこで封内筋と呼ばれる特殊な筋繊維を支配する。… ※「γ運動ニューロン」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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