| NOUN | body | musculus sphincter ani internus | an internal ring of smooth muscle formed by circular fibers of the rectum |
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| Meaning | An internal ring of smooth muscle formed by circular fibers of the rectum. | |
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| Part of | anal sphincter, sphincter ani, musculus sphincter ani | The sphincter muscle of the anus |
| Broader | smooth muscle, involuntary muscle | A muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart) |
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