Human anatomy anus

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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The Rectum

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The Anal Canal - Structure - Arterial Supply - TeachMeAnatomy

The final segment of the rectum, the ampulla , relaxes to accumulate and temporarily store faeces until defecation occurs. It is continuous with the anal canal; which passes through the pelvic floor to end as the anus. In the superior third of the rectum, the anterior surface and lateral sides are covered by peritoneum. In females, the peritoneum reflects to the posterior vagina and cervix, forming the rectouterine pouch pouch of Douglas. Fig 2 — The peritoneal reflections of the rectum in males A and females B. The rectum is located within the pelvic cavity , and is the most posterior of the pelvic viscera.
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Human anus

The anal canal is located within the anal triangle of the perineum between the right and left ischioanal fossae. It is the final segment of the gastrointestinal tract, around 4cm in length. The canal begins as a continuation of the rectum and passes inferoposteriorly to terminate at the anus.
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The anal canal is the terminal segment of the large intestine , between the rectum and anus , located below the level of the pelvic diaphragm. It is located within the anal triangle of the perineum , between the right and left ischioanal fossa. As the final functional segment of the bowel , it functions to regulate release of excrement by two muscular sphincter complexes.
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