Smooth Muscle / Internal Sphincter
The internal sphincter in a normal individual is represented by a thickening of the circular layer of the smooth involuntary muscle of the bowel, located in the anorectal area.
The precise limits of this structure at different ages has not been accurately determined.
Normal Anatomy Coronal View | 
Normal Anatomy Sagittal View
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For more information or to request an appointment, please contact the Colorectal Center at Cincinnati Children's.
