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SphincterFrom late Latin sphincter, from Greek sphinkter, band, contractile muscle, from sphingein, to bind tight. A sphincter is a ring-like muscle that normally maintains constriction of a natural body passage or orifice and that relaxes as required by normal physiological functioning. Some examples of sphincters include: 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sphincter".