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[Gr. sphinktēr, tight band] A circular muscle constricting an orifice. In normal tonic condition, it closes the orifice, i.e., the muscle must relax to allow the orifice to open.
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Venes, Donald, editor. "Sphincter." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/3/sphincter.
Sphincter. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/3/sphincter. Accessed February 23, 2020.
Sphincter. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/3/sphincter
Sphincter [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2020 February 23]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/3/sphincter.
* Article titles in AMA citation format should be in sentence-case
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