Sphincter - Sphincter
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A circular muscle is a ring-shaped muscle that tightens and closes an area when it contracts. It can be smooth or striated. There are various types of circular muscles, such as the sphincter pupillae, which constricts the pupil, the pyloric sphincter at the border between the stomach and small intestine, the urethral sphincter, which keeps the urethra and anus closed, the internal anal sphincter, and the external anal sphincter. → Related topics Muscles Source : Heibonsha Encyclopedia About MyPedia Information |
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環状筋のうち，収縮すればその部位を締めつけ閉じる働きをする輪状の筋肉。平滑筋も横紋筋もある。瞳孔(どうこう)をせばめる瞳孔括約筋，胃と小腸の境の幽門括約筋，尿道や肛門を締めておく尿道括約筋，内肛門括約筋，外肛門括約筋などがある。 →関連項目筋肉 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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