====== Sphincter ======

A sphincter is an anatomical structure, a cylindrical muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals; there are over 50 types in the human body, some microscopically small, in particular the millions of precapillary sphincters.

Sphincters relax at death, possibly releasing fluids.

see [[Bladder dysfunction]]