- Look up
sphincter in Wiktionary, the free dictionary. A
sphincter is a
circular muscle that
normally maintains constriction of a
natural body p****age...
-
known respectively as the
upper esophageal sphincter and the
lower esophageal sphincter.
These sphincters act to
close the
esophagus when food is not...
-
urethral sphincter and the
internal urethral sphincter. When
either of
these muscles contracts, the
urethra is
sealed shut. The
external urethral sphincter originates...
- The
sphincter of Oddi (also
hepatopancreatic sphincter or Glisson's
sphincter),
abbreviated as SO, is a
muscular valve that in some animals, including...
- is
located between the
esophagus and the
small intestine. The
pyloric sphincter controls the p****age of
partially digested food (chyme) from the stomach...
- the duodenum. The **** is
surrounded by a
sphincter, a band of muscle,
called the
pyloric sphincter. The word
pylorus comes from Gr**** πυλωρός, via...
- The
external anal
sphincter (or
sphincter ani externus) is an oval tube of
skeletal muscle fibers. Distally, it is
adherent to the skin
surrounding the...
- The
internal anal
sphincter, IAS, or
sphincter ani
internus is a ring of
smooth muscle that
surrounds about 2.5–4.0 cm of the anal canal. It is
about 5 mm...
- The iris
sphincter muscle (pupillary
sphincter,
pupillary constrictor,
circular muscle of iris,
circular fibers) is a
muscle in the part of the eye called...
- The
internal urethral sphincter is a
urethral sphincter muscle which constricts the
internal urethral ****. It is
located at the
junction of the urethra...
