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. [ http://en.wikipedia.org/wiki/Sphincter ]

This is just here as a test because I lose it

Term information

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.

external ontology notes

FMA class is not a subtype of muscle

has exact synonym

sphincter

has related synonym

circular muscle

id

UBERON:0004590

Term relations

Subclass of: