External anal sphincter
External Anal Sphincter
The External Anal Sphincter (pronunciation: ex-ter-nal a-nal s-fin-cter) is a flat plane of skeletal muscle in the anal canal. It is in a state of constant contraction, except during the process of defecation.
Etymology
The term originates from the Latin sphincter, meaning "band" or "tightener", and anus, meaning "ring". The prefix external is used to differentiate it from the internal anal sphincter, which is a separate muscle located inside the anal canal.
Function
The primary function of the external anal sphincter is to control the expulsion of feces from the body. It is voluntarily controlled, unlike the internal anal sphincter, which operates involuntarily. This allows for the conscious decision to defecate.
Related Terms
- Internal Anal Sphincter: The smooth muscle that is not under voluntary control, which helps maintain the resting pressure of the anal canal.
- Anal Canal: The final segment of the gastrointestinal tract through which feces are expelled from the body.
- Defecation: The final act of digestion, where one eliminates waste material from the digestive tract via the anus.
- Skeletal Muscle: A type of muscle tissue that is attached to bones and allows for voluntary movement of the body.
See Also
External links
- Medical encyclopedia article on External anal sphincter
- Wikipedia's article - External anal sphincter
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