Anus
Anatomical Glossary

The anus is a canal at the end of the digestive tract through which feces is expelled.

It is about five inches long and is an extension of the rectum. It is only open during the expulsion of feces, because it is usually kept closed by sphincter muscles, which can be relaxed at will.
 

Did you know ?

Babies have more bones than an Adult 

When you were born, you had 350 bones in your body, and after childhood 144 of these bones fused together.

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