the Circular Structure Inside the Anus: Is It the Sphincter?

When inserting a finger into the anus, there is a ring-like structure that can be felt approximately one finger's length in?

I previously experienced constipation and anal fissures, so I bought hemorrhoid cream to apply.
While applying the cream, I noticed a ring-like structure inside the anus (about the size of a finger joint; I could feel it while applying the cream).
It feels very smooth inside, similar to the sensation of a rubber band wrapped around the outside of a pipe.
Could this be the anal sphincter? Thank you.

WW, 30~39 year old female. Ask Date: 2024/06/08

Dr. Chen Shidian reply Gastroenterology and Hepatology

The anal canal and sphincter tissue should not be subjected to excessive manipulation.

Reply Date: 2024/06/08

More Info

The circular structure you are feeling inside the anus is indeed related to the anal sphincter, which is a crucial component of the anal anatomy. The anal sphincter consists of two main parts: the internal anal sphincter and the external anal sphincter.
1. Internal Anal Sphincter: This is an involuntary muscle that is always contracted to maintain continence. It is controlled by the autonomic nervous system and is located just inside the anal canal. This muscle helps prevent the involuntary passage of stool and gas.

2. External Anal Sphincter: This is a voluntary muscle that surrounds the internal sphincter and is under conscious control. It allows you to hold in stool until you are ready to defecate. This muscle can be contracted or relaxed at will, which is essential for bowel control.

The sensation you describe, where you feel a smooth circular structure, is likely the external anal sphincter. The smoothness you feel is typical, as the sphincter muscles are designed to be tight and smooth to facilitate their function in maintaining continence.
In addition to the sphincters, the anal canal also contains other structures, such as the anal columns (which are folds of tissue) and the anal valves (which are small folds at the lower end of the anal columns). These structures play a role in the function of the anal canal and help in the process of defecation.

Given your history of constipation and anal fissures, it is important to understand that the anal sphincters can become tense or spastic, which may contribute to discomfort or difficulty during bowel movements. Chronic constipation can lead to increased pressure in the anal region, potentially resulting in fissures or hemorrhoids, which can cause pain and bleeding.

If you are experiencing ongoing issues with constipation or anal pain, it may be beneficial to consult a healthcare provider. They can assess your symptoms, provide guidance on dietary and lifestyle changes, and recommend treatments to alleviate your symptoms. This may include increasing fiber intake, staying hydrated, and possibly using stool softeners or laxatives as needed.

In summary, the structure you are feeling is likely the external anal sphincter, which is essential for controlling bowel movements. If you have concerns about your anal health or experience persistent symptoms, seeking medical advice is advisable to ensure proper management and care.

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