What is the definition of sphincters?

What is the definition of sphincters?

Definition of sphincter : an annular muscle surrounding and able to contract or close a bodily opening.

Where does the word sphincter?

1570s, from French sphincter, from Late Latin sphincter “contractile muscle,” from Greek sphinkter “band, lace, anything that binds tight,” from sphingein “to squeeze, bind,” of unknown origin. First used in anatomical sense by Galen.

Is sphincter a real word?

noun Anatomy. a circular band of voluntary or involuntary muscle that encircles an orifice of the body or one of its hollow organs.

What are examples of sphincters?

Examples of sphincters

  • The sphincter pupillae, or pupillary sphincter, belonging to the iris in the eye.
  • The orbicularis oris muscle, a muscle around the mouth.
  • The upper esophageal sphincter.
  • The cardia/lower esophageal sphincter, or cardiac sphincter at the upper portion of the stomach.

What’s another word for sphincter?

Sphincter synonyms Find another word for sphincter. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for sphincter, like: detrusor, pyloric, eustachian-tube, esophagus, dyssynergia, urethral, anatomical sphincter, sphincter muscle and urethra.

What is the second sphincter?

A second sphincter, the external anal sphincter, is composed of striated muscle and is divided into three parts known as the subcutaneous, superficial, and deep external sphincters.

Is sphincter a Latin?

Borrowed from Late Latin sphinctēr (“the muscle of the anus”), from Ancient Greek σφῐγκτήρ (sphinktḗr, “lace, band; contractile muscle”).

Is mouth a sphincter?

The orbicularis oris muscle, also known as the orbicular muscle of the mouth, (TA: musculus orbicularis oris) is one of the facial muscles and its primary action is as the sphincter of the mouth.

What are the 5 sphincters?

Terms in this set (5)

  • lower esophageal or cardiac. sphincter between esophagus and stomach.
  • pyloric. Sphincter between stomach and duodenum.
  • ileocecal. Sphincter between small intestine and caecum.
  • anal. Sphincter at end of rectum.
  • upper esophageal. Sphincter between mouth and esophagus.

What are the 4 sphincters found in the body?

Four distinct smooth muscle sphincters are present in the GI tract: the lower esophageal sphincter (LES), the pyloric sphincter (PS), the ileocecal sphincter (ICS), and the internal anal sphincter (IAS).

How many sphincters are in a human body?

There are at least 50 or 60 different types of sphincters in the human body. Some are microscopic, such as the millions of precapillary sphincters in the circulatory system.

What is the synonym of stomach?

abdomen, belly, gut, middle. informal tummy, tum, breadbasket, insides. Australian informal bingy. 2’his fat stomach’ paunch, pot belly, beer belly, girth.

What is the meaning of sphincter?

Definition of sphincter : an annular muscle surrounding and able to contract or close a bodily opening medical : a ring-shaped muscle that surrounds a body opening and that can tighten to close the opening

Where are sphincters found in the body?

Other sphincters are found in the iris of the eye, the bile duct ( sphincter of Oddi ), the urinary tract, and elsewhere. anal sphincter ( sphincter a´ni) either of two sphincters (the internal and external anal sphincters) that open and close to control evacuation of feces from the anus.

What is sphincter ring?

A muscle ring, or local thickening of the muscle coat, surrounding a tubular passage or opening in the body. When a sphincter contracts it narrows or closes off the passageway. Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005 sphincter

What is a hepatic sphincter?

sphinc′ter·al adj. sphincter. a circular band of muscle fibers that constricts a passage or closes a natural opening in the body, such as the hepatic sphincter in the muscular coat of the hepatic veins near their union with the superior vena cava, and the external anal sphincter, which closes the anus.