…A spindle-shaped sac-like structure that exists in parallel with striated muscle fibers in muscles and contains several intrafusal muscle fibers. Both ends of intrafusal muscle fibers are striated and they contract in response to impulses from thin motor nerve fibers called gamma fibers. The center of intrafusal muscle fibers is unstriated and contains the ends of sensory nerve fibers. When a skeletal muscle is stretched, the intrafusal muscle fibers are also stretched, exciting the sensory nerve endings and generating impulses. … *Some of the terminology that refers to "gamma fiber" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…筋肉中に横紋筋繊維と並行して存在する紡錘形の囊状構造物で,内部に数本の錘内筋繊維を含む。錘内筋繊維の両端部は横紋があり,ガンマ繊維という細い運動神経繊維からのインパルスにより収縮する。錘内筋繊維の中央部には横紋がなく,感覚神経繊維の末端が入りこんでおり,骨格筋が伸長されると錘内筋繊維も伸長され感覚神経末端が興奮してインパルスを発生する。… ※「ガンマ繊維」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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