Gourt > Health > Conditions and Diseases > Cancer > Gastrointestinal > Anal
In anatomy, the anus (from Latin ānus "ring, anus") is the external opening of the rectum. Closure is controlled by sphincter muscles. Feces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus. Most animals — from simple worms to elephants and humans — have a tubular gut, with a mouth at one end and an anus at the other.
The anus is often considered a taboo part of the body, and is known by a large number of usually vulgar slang terms.
Structure
The human anus is situated between the buttocks, posterior to the perineum. It has two anal sphincters, one internal, the other external. These hold the anus closed until time to defecate. One sphincter consists of smooth muscle and its action is involuntary; the other consists of striated muscle and its action is voluntary. In many animals, the anus is surrounded by anal sacs. More on [ Anus ]
Chronic Illness
Intestinal Disorders
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CancerBACUP: Anal Cancer - Information about this type of cancer includes symptoms, diagnosis, and treatment.
Meta Description: [ This section is about anal cancer. It describes what it is, causes, symptoms, diagnosis and treatment ]
GayHealth: Anal Cancer - Summary discussion of the topic.
Meta Description: [ GayHealth.com the first worldwide source of health and wellness information for the lesbian, gay, transgender, and bisexual communities founded and operated by lesbian and gay medical professionals. ]
NCI: Anal Cancer - Resource from the U.S. National Cancer Institute including causes, genetics, prevention, statistics, treatment and clinical trials.
Meta Description: [ Information about anal cancer treatment, clinical trials, and other topics from the National Cancer Institute. ]
OncoLink: Anal Cancer - Presents an overview of topics such as treatment options, support and news.
Meta Description: [ OncoLink, the Web's first cancer resource, provides comprehensive information on all cancer types, cancer treatments, cancer research advances, continuing medical education, and cancer prevention. ]
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