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括約肌 - 維基百科，自由的百科全書 - zh.…
括約肌 （英語： Sphincter）是人或一些動物身上的一種肌肉類型。這種類型的肌 …
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Wikipedia
https://en.wikipedia.org › wiki › Sphincter
Sphincter - Wikipedia
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and relaxes as required by normal physiological functioning. Sphincters are found in many animals. There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters. Sphincters relax at death, often releasing fluids and fae…
Functioning
Each sphincter is associated with the lumen (opening) it surrounds. As long as the sphincter muscle is contracted, its length is shortened and the lumen is constricted (closed). Relaxation of the muscle causes it to lengthen, ope… 展开
Classifications
Sphincters can be further classified into functional and anatomical sphincters:
• Anatomical sphincters have a localised and often circular muscle thickening to facilitate their action as a sphincter.
• Functional sphin… 展开
Human anus - Wikipedia
The internal anal sphincter (an involuntary muscle) responds to the pressure by relaxing, thus allowing the feces to enter the canal. The rectum shortens as feces are pushed into the anal canal and peri…
Wikipedia
Urethral sphincters - Wikipedia
The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The two muscles are either the male or female external urethral sphincter and the inter…
Wikipedia
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https://zh.wikipedia.org › wiki › 括约肌
括约肌 - 维基百科，自由的百科全书
括约肌（英語： Sphincter）是人或一些动物身上的一种肌肉类型。这种类型的肌肉分布在管腔壁，當收缩的时候管腔就会被关闭，當放松的时候管腔就会开放。
维基百科
https://zh.wikipedia.org › zh-tw › 括约肌
括約肌 - 維基百科，自由的百科全書 - zh.wikipedia.org
括約肌（英語： Sphincter）是人或一些動物身上的一種肌肉類型。這種類型的肌肉分布在管腔壁，當收縮的時候管腔就會被關閉，當放鬆的時候管腔就會開放。
- 预计阅读时间：1 分钟
Wikipedia
https://en.wikipedia.org › wiki › Human_anus
Human anus - Wikipedia
The internal anal sphincter (an involuntary muscle) responds to the pressure by relaxing, thus allowing the feces to enter the canal. The rectum shortens as feces are pushed into the anal …
Wikipedia
https://en.wikipedia.org › wiki › Urethral_sphincters
Urethral sphincters - Wikipedia
The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The two muscles are either the male or female external urethral sphincter …
- 预计阅读时间：6 分钟
Sphincter wikipedia 的视频

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Sphincters - The Fascinating Truth
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urinary sphincter
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Anatomical VS Physiological Sphincter | GIT | Anatomy
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lower esophageal sphincter
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Functioning of the Upper Esophageal Sphincter - Michael Groher | MedBridge
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Wiktionary
https://en.wiktionary.org › wiki › sphincter
sphincter - Wiktionary, the free dictionary
2025年1月5日 · sphincter (plural sphincters) (anatomy) A ringlike band of muscle that surrounds a bodily opening (such as the anus or the openings of the stomach), constricting and relaxing as …
维基百科
https://zh.wikipedia.org › zh-hans › 括约肌
括约肌 - 维基百科，自由的百科全书 - zh.wikipedia.org
括约肌（英语： Sphincter）是人或一些动物身上的一种肌肉类型。这种类型的肌肉分布在管腔壁，当收缩的时候管腔就会被关闭，当放松的时候管腔就会开放。
其他用户还问了以下问题
What does sphincter mean?
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 relaxes as required by normal physiological functioning. Sphincters are found in many animals.
Sphincter - Wikipedia
en.wikipedia.org
What are urethral sphincters used for?
The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The two muscles are either the male or female external urethral sphincter and the internal urethral sphincter. When either of these muscles contracts, the urethra is sealed shut.
Urethral sphincters - Wikipedia
en.wikipedia.org
Where is the internal sphincter muscle located?
The internal sphincter muscle of urethra: located at the bladder's inferior end and the urethra's proximal end at the junction of the urethra with the urinary bladder. The internal sphincter is a continuation of the detrusor muscle and is made of smooth muscle, therefore it is under involuntary or autonomic control.
Urethral sphincters - Wikipedia
en.wikipedia.org
Which sphincter controls the exit of feces from the body?
Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter, which are circular muscles that normally maintain constriction of the orifice and which relax as required by normal physiological functioning.
Human anus - Wikipedia
en.wikipedia.org
Is the internal sphincter autonomic?
The internal sphincter is a continuation of the detrusor muscle and is made of smooth muscle, therefore it is under involuntary or autonomic control. This is the primary muscle for prohibiting urination.
Urethral sphincters - Wikipedia
en.wikipedia.org
What is a sphincter in the esophagus?
The sphincter pupillae, or pupillary sphincter, belonging to the iris in the eye. The orbicularis oculi muscle, a muscle around the eye. The lower esophageal sphincter, or cardiac sphincter, at the upper portion (cardia) of the stomach. This sphincter prevents the acidic contents of the stomach from moving upward into the esophagus.
Sphincter - Wikipedia
en.wikipedia.org
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Wikipédia
https://fr.wikipedia.org › wiki › Sphincter
Sphincter — Wikipédia
Un muscle sphincter (ou sphincter) est un muscle circulaire situé autour d’un conduit naturel (tube digestif, urètre, voies billiaires). Sa contraction permet de fermer partiellement ou totalement …
Wikipedia
https://en.wikipedia.org › wiki › External_anal_sphincter
External anal sphincter - Wikipedia
The external anal sphincter (or sphincter ani externus) is an oval tube of skeletal muscle fibers. [1] Distally, it is adherent to the skin surrounding the margin of the anus. [2] It exhibits a resting …
WikiDoc
https://www.wikidoc.org › index.php › Sphincter
Sphincter - wikidoc
A sphincter is a structure, usually a circular muscle, that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological …
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