Sphincter anus rectum other names


Sphincter anus rectum other names

The external anal sphincter (or sphincter ani externus) is a flat plane of muscular fibers, (1) It is, like other muscles, always in a state of tonic contraction, and having no antagonistic muscle it keeps the anal canal and orifice shut. pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (rectum).

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The internal anal sphincter, IAS, (or sphincter ani internus) is a muscular ring that surrounds about – cm of the anal canal; its inferior border is in contact.

Sphincter anus rectum other names

The inhibition of internal anal sphincter tone by rectal distension is called the . of phases and duration among different quandrants of the anal sphincter are the . provides short-term augmentation of anal pressure to postpone defecation.

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Sphincter anus rectum other names

Description:It consists of two strata, superficial and deep. The superficial, constituting the main portion of the muscle, arises from a narrow tendinous band, the anococcygeal raphe , which stretches from the tip of the coccyx to the posterior margin of the anus; it forms two flattened planes of muscular tissue, which encircle the anus and meet in front to be inserted into the central tendinous point of the perineum , joining with the superficial transverse perineal muscle , the levator ani , and the bulbospongiosus muscle also known as the bulbocavernosus. The deeper portion forms a complete sphincter to the anal canal.

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