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The anatomy of the anus

Naked Porn tube The anatomy of the anus.

The rectum is the concluding part of the large intestine that terminates in the anus.

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The average length of the human rectum may range between 10 and 15 cm. Its diameter can be compared to that of the sigmoid colon the part of the large intestine nearest the rectum at its onset.

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However, it becomes larger near the anus, where it forms the rectal ampulla. The key role of the rectal ampulla is to act as a temporary storehouse for feces.

WebMD provides a medical diagram...

The expansion of the rectal walls causes the stretch receptors within the walls to stimulate the urge to defecate. If the defecation process is delayed, it may result in constipation.