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The anus is the end of the large intestine, where food waste exits the body. The anal sphincter is a group of muscles at the end of the rectum that controls the release of stool. The anal sphincter is made up of two rings of muscles—the internal anal sphincter and the external anal sphincter. The internal sphincter is an involuntary muscle that contracts during rest and sleep, keeping small amounts of liquid and gas from escaping. The external sphincter, on the other hand, is a voluntary muscle that can be controlled and closed more firmly. These muscles can be strengthened through exercises such as Kegels, which can help treat bowel incontinence or reduce the chance of leaking stool or gas.
| Characteristics | Values |
|---|---|
| Name | Anal sphincter |
| Location | End of the rectum, surrounds the anus |
| Function | Controls the release of stool, maintains continence |
| Structure | Two rings of muscles: internal anal sphincter and external anal sphincter |
| Control | Internal: involuntary muscle, external: voluntary muscle |
| Strengthening exercises | Kegel exercises, pelvic floor exercises |
| Related conditions | Fecal incontinence, anal stenosis, anismus, anal fissures |
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What You'll Learn
The anal sphincter is made up of two rings of muscle
The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas. The anal sphincter is made up of two rings of muscle—the internal anal sphincter and the external anal sphincter. These muscles surround the entrance of the anus and can open and close. The internal anal sphincter is an inner ring of muscle and is an involuntary muscle, which means you cannot consciously control it. Similar to your beating heart and diaphragm, this muscle does its job every second of the day without you having to think about its function. The internal sphincter is programmed to stay shut, which is why most adults do not leak stool while they sleep. The internal anal sphincter is a thin, white muscle wrapped around the anal canal. It contracts during rest and sleep, keeping small amounts of liquid and gas from escaping unexpectedly.
The outer ring of muscle around the anus is the external anal sphincter, a voluntary muscle that you can control and close more firmly. This muscle can be exercised and strengthened to help maintain control of bowel movements. The external anal sphincter is a thick, red voluntary muscle. It is wrapped around the internal anal sphincter muscle. It is the muscle you squeeze when you feel the urge to go to the bathroom but are not near one. The anal sphincter muscles may be damaged if you have trouble holding in stool and/or urine (or if it leaks out) or if you have pain in your rectum. Pelvic floor dysfunction can also occur with sexual trauma or PTSD from trauma. You may tighten or tense up these muscles as a result of memories of the trauma. Excessive tensing of these muscles can cause hypertrophy, constipation, and worsen pelvic floor dysfunction.
The internal and external anal sphincters work together to produce a bowel movement. When food waste reaches the anus, it begins collecting in the flexible rectum. When enough waste has collected, a person will feel the need to go to the bathroom. Once the person is seated on the toilet, the anal sphincter should relax and allow the anal canal to empty. When the waste has been released from the canal, the anal sphincter restricts and remains in that condition until the process needs to occur again. The muscles that control the anal sphincter can be strengthened through exercise, which may help treat bowel incontinence (fecal incontinence) or reduce the chance of leaking stool or gas in the future.
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The internal sphincter is involuntary and stays shut
The anal sphincter is a group of muscles at the end of the rectum, which is the last few inches of the large intestine. The anal sphincter surrounds the anus and controls the release of stool, thereby maintaining continence. The anal sphincter is made up of two muscles: the internal anal sphincter and the external anal sphincter. The internal anal sphincter is an inner ring of muscle that is involuntary, meaning it cannot be consciously controlled. Similar to the beating heart and diaphragm, this muscle functions without conscious thought. The internal sphincter is programmed to stay shut, preventing stool and small amounts of liquid and gas from escaping unexpectedly. This is why most adults do not leak stool while they sleep.
The internal anal sphincter is a thin, white muscle wrapped around the anal canal. It is an involuntary smooth muscle, similar to the muscles of the intestines. It contracts during rest and sleep, keeping waste contained. The internal sphincter works in conjunction with the external sphincter to produce a bowel movement. When stool moves through the digestive tract, it triggers the internal anal sphincter to relax, which in turn makes the external anal sphincter contract. This response is called the defecation reflex.
The external anal sphincter is a thick, red voluntary muscle that surrounds the internal anal sphincter. It is the muscle that is squeezed when an individual feels the urge to go to the bathroom but is not near one. The external sphincter is under conscious control, allowing individuals to hold in stool until they are ready to have a bowel movement. The external anal sphincter can be exercised and strengthened to improve control over bowel movements.
Pelvic floor exercises, such as Kegel exercises, can be performed to strengthen the anal sphincter and improve bowel control. These exercises involve consciously tightening the pelvic floor muscles, which can help prevent fecal incontinence. However, it is important to note that tightening the pelvic floor muscles through exercise may not be effective in all cases of fecal incontinence, as some cases may be due to underlying medical conditions.
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The external sphincter is voluntary and can be controlled
The anal sphincter is a group of muscles at the end of the rectum that control the release of stool. The rectum is located at the last few inches of the large intestine. The anal sphincter surrounds the anus and maintains continence. The anal sphincter is made up of two muscles: the internal anal sphincter and the external anal sphincter. The internal anal sphincter is an involuntary muscle, which means that it functions without conscious control. This muscle is an inner ring of muscle that contracts during rest and sleep, preventing the unexpected escape of liquid and gas.
The external anal sphincter, on the other hand, is a voluntary muscle that can be controlled. It is a thick, red muscle wrapped around the internal anal sphincter. This is the muscle that you squeeze tightly when you need to control your bowel movement, such as when you feel the urge to go to the bathroom but are not near one. The external sphincter works in coordination with the internal sphincter to produce a bowel movement. When food waste reaches the anus, it collects in the rectum, and when enough waste has accumulated, a person feels the need to defecate. Once seated on the toilet, the external sphincter relaxes, allowing the anal canal to empty. After the waste is released, the external sphincter restricts again and remains closed until the next bowel movement.
The external anal sphincter can be exercised and strengthened to improve bowel control. Kegel exercises, which involve consciously tightening the pelvic floor muscles, can be effective in strengthening the external sphincter. These exercises can be done daily and are simple to perform. However, it is important to note that in some cases of fecal incontinence, tightening the pelvic floor muscles with exercise may not be effective and seeking medical advice is recommended.
The external anal sphincter also plays a role in other functions, such as controlling urine flow and flatulence. However, excessive tensing of these muscles can lead to issues such as hypertrophy, constipation, and pelvic floor dysfunction. Therefore, it is important to maintain a healthy balance and seek professional guidance if experiencing any problems.
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Pelvic floor dysfunction can cause the tightening of these muscles
The anus is surrounded by two rings of muscles, the internal and external anal sphincters, which open and close to let stool out of the body. The external anal sphincter is a voluntary muscle, which can be exercised and strengthened to help control bowel movements.
Pelvic floor dysfunction is the inability to relax and coordinate the pelvic floor muscles to pee or poop. Normally, the body is able to tighten and relax the pelvic floor muscles, but with pelvic floor dysfunction, the body keeps tightening these muscles instead of relaxing them. This tension can cause trouble evacuating a bowel movement, an incomplete bowel movement, and pee or poop leakage. Pelvic floor dysfunction can also cause pain during intercourse for women and erectile dysfunction for men.
Pelvic floor dysfunction can be caused by several factors, including traumatic injuries to the pelvic area, overuse of the pelvic muscles, prior pelvic surgery, pregnancy and childbirth, aging, stress and anxiety, and connective tissue disorders. The dysfunction can also occur with sexual trauma or PTSD from trauma, where individuals may tighten or tense up these muscles as a result of memories of the trauma.
Pelvic floor exercises, such as Kegel exercises, can be performed to strengthen the pelvic floor muscles and improve muscle tone and brain connection. These exercises can be done lying down, sitting, or standing, and aim for five to six sessions a day when first learning them.
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Exercises can help treat bowel incontinence and reduce stool leakage
The anal sphincter is made up of thick bands of muscle that surround the entrance of the anus and can open and close. The internal anal sphincter is an involuntary muscle, which means you cannot consciously control it. The external anal sphincter, on the other hand, is a voluntary muscle that you can control and close more firmly. This muscle can be exercised and strengthened to help maintain bowel control.
Exercises to strengthen the anal sphincter can help treat bowel incontinence (also known as faecal incontinence) and reduce the chance of leaking stool or gas. These exercises are particularly useful if you do not have an underlying disease or functional problem causing your incontinence. Pelvic floor muscle exercises, also known as Kegel exercises, are a well-known way to improve faecal incontinence symptoms. To perform a Kegel exercise, simply squeeze the muscle around your back passage, lifting it as tightly as you can, as if you are worried about leaking stool. Your buttocks, tummy, and legs should remain still, but you should feel the muscle move and tighten.
Kegel exercises are simple to do and can be performed anywhere. They are similar to the action of stopping your urine flow midstream or holding in gas. If you have ever done either of these things, you have already performed a Kegel exercise. The key to success with Kegel exercises is knowing which muscles to contract.
In addition to exercises, simple treatments such as diet changes, medicines, and bowel training can also help improve faecal incontinence symptoms. It is important to speak to your healthcare provider about any bowel control problems you are experiencing. They can recommend treatments to help manage and relieve your symptoms.
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Frequently asked questions
The anal sphincter is a group of muscles at the end of the rectum that controls the release of stool. It has two rings of muscles: the internal anal sphincter and the external anal sphincter.
The internal anal sphincter is an involuntary muscle that contracts during rest and sleep, keeping small amounts of liquid and gas from escaping unexpectedly. The external anal sphincter is a voluntary muscle that you can control and close more firmly. These muscles work together to produce a bowel movement.
Some people may want to tighten their anus due to bowel incontinence or to reduce the chance of leaking stool or gas.
You can do exercises to strengthen and tighten your anal sphincter, such as Kegel exercises, which involve consciously tightening your pelvic floor muscles.
