Sphincters: Where They're Found and Purpose - Verywell Health
WEBApr 10, 2023 · Sphincters are circular muscles that open and close passages in the body to regulate the flow of substances, such as bile, urine, and feces, through the body. Although many are found in the gastrointestinal (GI) tract, there are also sphincters in the urinary tract and blood vessels. There are even those in the eyes that regulate the flow of light.
Anal Sphincter Function, Anatomy, and Complications - Verywell …
WEBJan 2, 2024 · The anal sphincter is a group of muscles at the end of the rectum. The rectum is located at the last few inches of the large intestine (colon). The anal sphincter surrounds the anus and controls the release of stool, thereby maintaining continence. There are two muscles: the internal anal sphincter and the external anal sphincter.
Sphincter muscle | Esophageal, Gastrointestinal & Urogenital
WEBsphincter urethrae. constrictor muscle. (Show more) sphincter muscle, any of the ringlike muscles surrounding and able to contract or close a bodily passage or opening. One of the most important human sphincter muscles is the sphincter pylori, a thickening of the middle layer of stomach muscle around the pylorus (opening into the small ...
Esophagus: Anatomy, sphincters, arteries, veins, nerves | Kenhub
WEBAug 30, 2023 · Anatomy. Sphincters. Blood supply. Arteries. Veins. Innervation. Sources. + Show all. Anatomy. The esophagus is divided into three parts: Cervical which travels through the neck. Thoracic which is located in the thorax, more specifically in the mediastinum. Abdominal which travels past the diaphragm into the abdomen, reaching …
Sphincter - Wikipedia
WEBSphincter. Look up sphincter in Wiktionary, the free dictionary. A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. …
Sphincter Definition & Meaning - Merriam-Webster
WEBnoun. sphinc· ter ˈsfiŋ (k)-tər. : an annular muscle surrounding and able to contract or close a bodily opening. sphincteric. sfiŋ (k)-ˈter-ik. adjective. Examples of sphincter in a …
Urethral sphincters: Attachments, innervation, action | Kenhub
WEBOct 30, 2023 · The urethral sphincter is a complex of muscles that encircle the urethra and control the flow of urine. In simple terms we can divide this complex into two urethral sphincters; an internal urethral sphincter and an external urethral sphincter. The internal urethral sphincter is located at the junction of the urethra and the urinary bladder.
Lower Esophageal Sphincter: Anatomy, Function, Treatment
WEBOct 13, 2023 · Muscles. The Anatomy of the Lower Esophageal Sphincter. Part of the swallowing process that’s involved in acid reflux and GERD. By Adrienne Dellwo. Updated on October 13, 2023. Medically reviewed by Priyanka Chugh, MD. Print. Table of Contents. How Does the Lower Esophageal Sphincter Work? What Does the Lower …
Pyloric sphincter: anatomy and function | Kenhub
WEBNov 22, 2023 · 1/7. Synonyms: none. The distal opening of the stomach, into the small intestine, is called the pyloric orifice. Movement of partially digested food ( chyme) through the pyloric orifice is controlled by a valve, the pyloric sphincter. The pyloric sphincter is formed by a thick circular layer of smooth muscle.
The esophageal sphincter: What to know - Medical News Today
WEBJan 28, 2022 · The esophageal sphincters are bands of muscles at the top and bottom of the esophagus — the muscular tube that passes food and drink from the mouth to the stomach. Esophageal sphincters open and...
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