internal anal sphincter

in·ter·nal a·nal sphinc·ter

[TA] a smooth muscle ring, formed by an increase of the circular muscle fibers of the rectum, situated at the upper end of the anal canal, internal to the outer voluntary external anal sphincter. This sphincter is maximally contracted when the rectal ampulla is "at rest"-empty or relaxed to accommodate a distending fecal mass. It is inhibited with filling of the ampulla, increased distension, and peristalsis. Synonym(s): musculus sphincter ani internus [TA], internal sphincter muscle of anus

internal anal sphincter

A muscular ring surrounding the lower end of the rectum.

单词	internal anal sphincter
释义	internal anal sphincter in·ter·nal a·nal sphinc·ter [TA] a smooth muscle ring, formed by an increase of the circular muscle fibers of the rectum, situated at the upper end of the anal canal, internal to the outer voluntary external anal sphincter. This sphincter is maximally contracted when the rectal ampulla is "at rest"-empty or relaxed to accommodate a distending fecal mass. It is inhibited with filling of the ampulla, increased distension, and peristalsis. Synonym(s): musculus sphincter ani internus [TA], internal sphincter muscle of anus internal anal sphincter A muscular ring surrounding the lower end of the rectum. AcronymsSeeIAS
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