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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, 24th ed., F.A. Davis Company, 2021. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/all/sphincter.
Sphincter. In: Venes DD, ed. Taber's Medical Dictionary. F.A. Davis Company; 2021. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/all/sphincter. Accessed June 4, 2023.
Sphincter. (2021). In Venes, D. (Ed.), Taber's Medical Dictionary (24th ed.). F.A. Davis Company. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/all/sphincter
Sphincter [Internet]. In: Venes DD, editors. Taber's Medical Dictionary. F.A. Davis Company; 2021. [cited 2023 June 04]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/744281/all/sphincter.
* Article titles in AMA citation format should be in sentence-case
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