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The Sphincter ani internus (Internal sphincter ani) 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… More »
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The internal anal sphincter, the smooth muscle component of the anal sphincter complex, Despite its significant contribution to resting anal canal pressures, even total division of the internal anal sphincter in surgery for anal fistulas may fail to compromise continence in otherwise healthy subjects.
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Age effects on internal anal sphincter thickness and diameter in nulliparous females. PURPOSE: Age can affect the delicate physiologic balance of the internal anal sphincter diameters and pressure governed by Laplace's law.
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Sphincter ani internus muscle - Wikipedia, the free encyclopedia
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This is the exit of the rectum, and it is ringed by strong muscle, called anal sphincters. There are two such rings, the internal anal sphincter, About every 10 minutes, rectal distension leads to relaxation of the internal anal sphincter. This allows the contents of the rectum to descend to the upper part of the anus.
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Animal Model for the Study of Internal Anal Sphincter Activity I. Vinograd, M. Hanani, A. Hadary, P. Merguerian, S. Nissan Department of Surgery and Laboratory of Experimental Surgery, This paper describes a simple and reliable model for studying the internal anal sphincter (IAS) in the rat.
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Neurally mediated relaxation of opossum internal anal sphincter: influence of superoxide anion generator and the scavenger...
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RhoA Prenylation Inhibitor Produces Relaxation of Tonic Smooth Muscle of Internal Anal Sphincter However, the effect and role of RhoA prenylation in the spontaneously tonic smooth muscle, such as internal anal sphincter (IAS), is not known.
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Autocrine regulation of internal anal sphincter tone by renin-angiotensin system: comparison with phasic smooth muscle The myogenic control mechanisms that govern the basal tone in the internal anal sphincter (IAS) are not known.
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The author's purpose, with this study, was to determine the significance of focal hypertrophy of the internal anal sphincter on anal endosonography. Of these 12 cases, 2 had focal hypertrophy of the internal anal sphincter at the same location of the external anal sphincter tear.
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