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In humans , the anus from Latin anus meaning "ring", "circle" [1] [2] is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum.
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Doctors discover a Portuguese woman has 2 anuses

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Human anus - Wikipedia

By Stephen Matthews For Mailonline. Doctors have told of their surprise after discovering a Portuguese woman they were examining had two anal canals. The unidentified patient was referred to specialists after enduring two abscesses on her bottom, which both required 'drainage'. Upon closer inspection, medics in Figueria da Foz - 87 miles km south of Porto, saw two holes leaving her anus - instead of the usual one.
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Human anus

An anal sphincter is a group of muscles at the end of the rectum that surrounds the anus and controls the release of stool, thereby maintaining continence. There are two sphincter muscles: one is internal and one is external. The external muscle helps maintain continence and keep stool in the rectum. If there is a loss of muscle control in the sphincter, incontinence may occur. The inner muscle is not under voluntary control but rather is controlled by the autonomic nervous system.
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An imperforate anus or anorectal malformations ARMs are birth defects in which the rectum is malformed. ARMs are a spectrum of different congenital anomalies which vary from fairly minor lesions to complex anomalies. There are several forms of imperforate anus and anorectal malformations. The new classification is in relation of the type of associated fistula. Imperforate anus is usually present along with other birth defects— spinal problems, heart problems, tracheoesophageal fistula , esophageal atresia , renal anomalies and limb anomalies are among the possibilities, collectively being called the VACTERL association.