![]() ![]() Sometimes, treatment may be different, depending on where the cancer is located. Cancers of the perianal skin (below the anal verge) – previously called cancers of the anal margin. ![]() Cancers of the anal canal (above the anal verge).This skin around the anal verge (called the perianal skin or the anal margin) is also made up of squamous cells, but it also contains sweat glands and hair follicles, which are not found in the lining of the lower anal canal.Īnal cancers are often divided into 2 groups based on where they start: At the anal verge, the squamous cells of the lower anal canal merge with the skin just outside the anus.Below the dentate line are flat (squamous) cells.About midway down the anal canal is the dentate line, which is where most of the anal glands empty mucus into the anus.This area is called the transitional zone. Most cells near the middle of the anal canal are shaped like cubes and are called transitional cells.Cells above the anal canal (in the rectum) and in the part of the anal canal close to the rectum are shaped like tiny columns.The cells of the anal canal change as they go from the rectum to the anal verge: The glands make mucus, which acts as a lubricating fluid. Glands and ducts (tubes leading from the glands) are found under the mucosa. Most anal cancers start from cells in the mucosa. The inner lining of the anal canal is the mucosa. This skin around the anal verge is called the perianal skin (previously called the anal margin). The anal verge is where the canal connects to the outside skin at the anus. The anal canal is about 1-1/2 to 2 inches (about 3 to 5 cm) long and goes from the rectum to the anal verge. The anal canal has two ring-shaped muscles (called sphincter muscles) that keep the anus closed and prevent stool from leaking out. The anus is connected to the rectum by the anal canal. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |