A structure, usually a circular muscle, that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. [ Wikipedia:Sphincter ]
术语信息
database
cross reference
- NCIT:C28381
- Wikipedia:Sphincter
- FMA:75004
- UMLS:C1409894 (ncithesaurus:Sphincter)
definition
A structure, usually a circular muscle, that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning.