Sphincter

From 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:

Anus
Cardia
Urethral sphincter

		Sphincter
		From 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: Anus Cardia Urethral sphincter
Feel free to point to this article