Picture of anus with brown pigment
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The anus is connected to the rectum by the anal canal. The anal canal has two ring-shaped muscles called sphincter muscles that keep the anus closed and prevent stool from leaking out. The anal verge is where the canal connects to the outside skin at the anus. This skin around the anal verge is called the perianal skin previously called the anal margin. The inner lining of the anal canal is the mucosa.


Melanosis coli




udimonteverde.org: A Collection of Surgical Pathology Images
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Disorders of the Rectum and Anus in Dogs
Comments: Melanosis coli is dark brown-black pigmentation of colorectal mucosa associated with chronic use of laxatives containing anthraquinone. Examples of such laxatives include senna and rhubarb derivatives. Clinical Importance : There is no association between colorectal cancer and melanosis coli or laxative use. However, colorectal adenomas are found more frequently in patients with melanosis coli during endoscopy.





Diseases of the rectum and anus can be congenital inherited or occur later in life. Anal sac disease is caused by clogging or infection of glands called anal sacs located on each side of the anus. It is the most common disease of the anal region in dogs. The anal sacs are related to the scent glands in skunks and produce a small amount of foul-smelling liquid. The liquid is normally squeezed out during defecation.


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