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  • An anatomical line of demarcation that separates the upper and lower part of the anal canal, both in structure and neurovascular supply, reflecting the different embryologic origin; superior to the line the epithelium is a mucous membrane like the rest of the gastrointestinal tract and inferiorly the epithelium is considered cutaneous, and is composed of stratified squamous keratinized with hair and sebaceous glands.
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Anon_0  
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