括约肌 musculus sphincter
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690
具有使环状或管状器官闭锁作用的环状肌(例:瞳孔括约肌、幽门括约肌)。与此相反,同时也有伴生起对抗作用的扩散肌(例:瞳孔散大肌)。瞳孔括约肌及瞳孔扩散肌,幽门括约肌(是胃幽门部特别发达的环状肌),肛门括约肌中的内肛括约肌(musculus sphi- ncter ani externus)为横纹肌。
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