Encyclopedia > Sphincter

  Article Content

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:



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Colossal squid

... a complete specimen was found near the surface of the Ross Sea[?]. This specimen was larger than any other invertebrate known, with a total length of 6 metres and ...