In humans, the anus (from Latin anus meaning "ring", "circle") is the external opening of the rectum, located inside the intergluteal cleft and separated from the genitals by the perineum. 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.

Notice :

-This app is develop for education and medical research purpose with fair use law is apply under creative common license and does not violate the policy about Google-served ads on screens with replicated content . Fair use is a doctrine law that permits limited use of copyrighted material without having to first acquire permission from the copyright holder for education and medical research purpose .

-Content that contains nudity may be allowed if the primary purpose is educational, documentary, scientific or artistic, and is not gratuitous.

-Please don't flag this app as Inappropriate Content because this app is develop for education and medical research purpose .

-Please just download this application if you're age above 18+ and intended to study about anatomy and medical education because this app does not have any content or services intended to be sexually gratifying .