The inner lining of the anal canal is the mucosa. Most anal cancers start from cells in the mucosa. Glands and ducts tubes leading from the glands are found under the mucosa. The glands make mucus, which acts as a lubricating fluid.
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What Is Anal Cancer?
Winnie W. Templeton, Christopher K. Fairley, Fengyi Jin, I. Hillman, Andrew E. Grulich, Anthony D. Most anal cancers are attributable to persistent human papillomavirus type 16 HPV infection. The anal cancer precursor, high-grade squamous intraepithelial lesion HSIL , frequently regresses spontaneously.
The anus is an organ that lies at the end of the digestive tract below the rectum. It consists of two sections: the anal canal and the anus or anal verge. The anal canal is a cm long structure that lies between the anal sphincter one of the muscles that controls bowel movements just below the rectum and the anal verge which represents the transition point between the digestive tract and the skin on the outside of the body. Muscles within the anal canal and anus control the passage of stool from the rectum to outside the body.