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*Termination of the lamina muscularis and longitudinal layer of the tunica muscularis.
 
*Termination of the lamina muscularis and longitudinal layer of the tunica muscularis.
 
*The circular layer of the tunica muscularis forms the internal anal sphincter.
 
*The circular layer of the tunica muscularis forms the internal anal sphincter.
**The external anal sphincter is formed from skeletal muscle.
+
*The external anal sphincter is formed from skeletal muscle.
    
===Rectum===
 
===Rectum===
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