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The internal anal sphincter, ias, (or sphincter ani internus) is a ring of smooth muscle that surrounds about 2. 0 cm of the anal canal its inferior border is in contact with, but quite separate from, the external anal sphincter. It is about 5 mm thick, and is formed by an aggregation of the involuntary circular fibers of the rectum. While resting anal sphincter tone is not affected by spinal transection between c6 and l1, 36, 49 high spinal anesthesia reduced resting tone, suggesting extrinsic nerves may contribute to resting sphincter tone. 51, 87 moreover, resting sphincter tone declined by an average of 30 after bilateral hypogastric nerve sectioning and an average of 63 after lumbar colonic nerve sectioning in dogs. The external anal sphincter (or sphincter ani externus) is a flat plane of skeletal muscle fibers, elliptical in shape and intimately adherent to the skin surrounding the margin of the anus. The external anal sphincter measures about 8 to 10 cm in length, from its. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter. What is the anal sphincter? The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive. Squeezing and contracting the anal sphincter exercising the anal sphincter muscles, i. In vitro spontaneous contraction of 7-12 and 11-17 cycles per min (cpm) could be seen in colonic smooth muscle and ias respectively. The contracting frequency of anal sphincter from the manometric figures was 12 cpm-18 cpm under the resting condition in these volunteers.