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A D V E R T I S E M E N T
A D V E R T I S E M E N T
The external anal sphincter mechanism sits below the puborectalis which forms an anterior sling. The lower part of the sphincter cuff is attached posteriorly by the ano-coccygeal raphe. The anterior height of the external sphincter is less in the female than in the male. The internal anal sphincter, a thickened portion of the internal circular muscle layer of the rectum, extends almost down to the lower end of the external muscle cuff.
A D V E R T I S E M E N T
The primary surgeon moved to a position between the patient's legs and began the perineal dissection with a perianal incision.
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A D V E R T I S E M E N T
With assistance from above for orientation, the bottom team carefully dissected a wide margin around the sphincter mechanism laterally and posteriorly to reach the level of the levators.
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This page was last modified on 4/4/2000.
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