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Rectum - Anatomy & Physiology (view source)

Revision as of 14:59, 14 July 2008

259 bytes removed ,  14:59, 14 July 2008
→‎Structure
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*At the rectoanal junction, the lumen is constricted by longitudinal folds in the mucosa.
 
*At the rectoanal junction, the lumen is constricted by longitudinal folds in the mucosa.
 
**These are normally pressed together to occlude the lumen.
 
**These are normally pressed together to occlude the lumen.
−
*There are ''two'' anal sphincters:
  −
**'''Internal anal sphincter''', formed by thickening of the circular smooth muscle of the gut and under autonomic control.
  −
**'''External anal sphincter''', formed from striated skeletal muscle and under voluntary control.
      
==Function==
 
==Function==
Shamilton
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