Everything about Sphincter Ani Internus Muscle totally explained
The
Sphincter ani internus (or
internal anal sphincter) is a muscular ring which surrounds about 2.5 cm of the
anal canal; its inferior border is in contact with, but quite separate from, the
Sphincter ani externus.
It is about 5 mm thick, and is formed by an aggregation of the involuntary circular fibers of the
intestine. Its lower border is about 6 mm from the orifice of the
anus.
Actions
Its action is entirely involuntary. It helps the Sphincter ani externus to occlude the anal aperture and aids in the expulsion of the
feces. It is innervated by parasympathetic nerves from S2, S3, and S4. It isn't innervated by the pundendal nerve, which is a somatic nerve.
Additional images
Image:illu_intestine.jpg|Intestines
Image:Hemorrhoid.png|Schematic demonstrating the anatomy of hemorrhoids.
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