The anus, in anatomy, is the external opening of the rectum. It is controlled by sphinctermuscles. Faeces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus.
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In the human female, the urethra is about 1-1.5 inches (25-38 mm) long and opens in the vulva between the clitoris and the vaginal opening.
In the human male, the ...