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Answer:
The anus is the opening where the gastrointestinal tract ends and exits the body. The anus starts at the bottom of the rectum, the last portion of the colon (large intestine). The anorectal line separates the anus from the rectum.
Tough tissue called fascia surrounds the anus and attaches it to nearby structures.Circular muscles called the external sphincter ani form the wall of the anus and hold it closed. Glands release fluid into the anus to keep its surface moist.A plate-like band of muscles, called the levator ani muscles, surround the anus and form the floor of the pelvis. A network of veins lines the skin of the anus.
Anus Conditions
Internal hemorrhoids: Swollen veins inside the anus or rectum. These cannot be seen from outside the body.
External hemorrhoids: Blood vessels that swell near the opening of the anus or bulge outside.
Anal cancer: Cancer of the anus is rare. Infection with human papillomavirus (HPV), anal sex, and multiple sexual partners increase the risk.
Anal herpes: Anal sex may spread the herpes viruses HSV-1 and HSV-2. Symptoms include painful sores around the anus that come and go.
Anal warts: Infection by the human papillomavirus (HPV) can lead to warts in and around the anus.
Anal fistula: An abnormal channel developing between the anus and the skin of the buttocks. Inflammatory bowel disease (Crohn’s and ulcerative colitis) or previous surgery are common causes.
Anal fissure: A tear in the lining of the anus, often caused by constipation. Pain, especially with bowel movements, is the main symptom.
Anal abscess: A pocket of infection in the soft tissue around the anus. Antibiotics and surgical drainage may be required to effectively treat an abscess of the anus.
Anal itching: Itching in or around the anus is a common problem. In most cases, no serious cause is responsible.
Proctalgia fugax: Sudden, severe pain in the area of the anus and rectum, lasting seconds or minutes, then disappearing. The cause is unknown.
Constipation: Difficulty passing stools is common, and can cause anal pain, anal fissures, and bleeding from hemorrhoids.
Anal bleeding: Bright red blood from the anus is sometimes from hemorrhoids, but requires evaluation to rule out a more serious cause.