Dominic Stone
Pooping is a taboo subject, but it's an essential and completely natural part of life. The pelvic floor is a group of muscles that forms a hammock at the bottom of your pelvis. These muscles, along with the anal sphincters, close off the bowel, preventing stool from leaving the body. When the rectum fills up, stretch receptors in the wall of the anus are alerted. Signals are sent to the brain, which then tells the anal sphincter muscles to relax, allowing the anus to open and the rectum to empty. Pelvic floor dysfunction can make it hard to poop, and it can cause chronic constipation.
| Characteristics | Values |
|---|---|
| Name | Pelvic floor muscles |
| Location | Bottom of the pelvis |
| Function | Controls bowel movements, physically supports pelvic organs, and closes off the lower part of the pelvic cavity |
| Related Conditions | Anismus, Dyssynergic Defecation, Pelvic Floor Dysfunction |
| Treatment | Pelvic Physical Therapy, Biofeedback Therapy, Kegel Exercises |
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What You'll Learn
Pelvic floor muscles and their role in bowel movements
The pelvic floor is a group of muscles that form a "hammock" at the bottom of the pelvis. These muscles support the pelvic organs, including the bladder, bowel (large intestine), and internal reproductive organs. The pelvic floor muscles hold these organs in place, allowing for flexibility during bodily functions like urination, defecation, and sexual activity.
During a bowel movement, the pelvic floor muscles play a crucial role in controlling the release of stool. When the rectum fills up, stretch receptors in the wall of the anus are activated, sending signals to the brain. The brain then processes this information and signals the pelvic floor to relax and descend slightly, allowing the muscles in the rectum to push the stool out.
The pelvic floor muscles work in coordination with the anal sphincters, which are also involved in controlling bowel movements. There is an inner (internal) and outer (external) sphincter at the end of the anal canal. The inner sphincter, composed of smooth muscle, remains closed when sleeping, preventing the rectum from opening. The outer sphincter supports the inner sphincter and can be controlled voluntarily, enabling individuals to empty their bowels or hold back stool as needed.
Pelvic floor dysfunction can occur when individuals cannot properly relax and coordinate their pelvic floor muscles during defecation. This condition can lead to symptoms such as constipation and fecal incontinence. Factors contributing to pelvic floor dysfunction include traumatic injuries, overuse of pelvic muscles, prior pelvic surgery, pregnancy, childbirth, aging, stress, and anxiety.
To maintain healthy bowel function, it is essential to care for the pelvic floor muscles. Pelvic floor exercises, such as Kegels, can help strengthen these muscles and improve coordination. By routinely squeezing and relaxing the pelvic floor muscles, individuals can enhance their control over bowel movements and prevent issues related to pelvic floor dysfunction.
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Inner and outer anal sphincter muscles
The anal sphincter is a group of muscles at the end of the rectum, which is located at the last few inches of the large intestine (colon). The anal sphincter surrounds the anus and controls the release of stool, thereby maintaining continence. There are two types of anal sphincter muscles: the internal anal sphincter and the external anal sphincter.
The internal anal sphincter, or sphincter ani internus, is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the anal canal. It is approximately 5 mm thick and is formed by the aggregation of the smooth (involuntary) circular muscle fibres of the rectum. The internal anal sphincter aids the external anal sphincter in occluding the anal aperture and facilitating the expulsion of faeces. Its action is entirely involuntary, and it is normally in a state of continuous maximal contraction to prevent the leakage of faeces or gases. The internal anal sphincter contributes 55% of the resting pressure of the anal canal and is crucial for bowel continence, especially for liquids and gases.
The external anal sphincter, or sphincter ani externus, surrounds the outside of the end of the anal canal. Unlike the internal sphincter, the external sphincter can be controlled voluntarily, allowing individuals to empty their bowels or hold back their stool at will. However, the external sphincter can also act involuntarily, either aiding or preventing the passage of stool. The internal and external anal sphincters work together to produce a bowel movement, with the internal sphincter relaxing and the external sphincter contracting to facilitate defecation.
The pelvic floor muscles, ligaments, and connective tissues make up the pelvic floor, which physically supports the pelvic organs and closes off the lower part of the pelvic cavity. The pelvic floor relaxes during a bowel movement and contracts when holding in stool. Pelvic floor dysfunction can contribute to bowel problems, and pelvic floor therapy or exercises can help improve coordination and correct issues with the pelvic floor muscles, including the external anal sphincter.
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How the brain and nerves work together to empty the bowel
The pelvic floor is a group of muscles that forms a "hammock" at the bottom of the pelvis. The pelvic floor muscles, ligaments, and connective tissue physically support the pelvic organs and close off the lower part of the pelvic cavity. The pelvic floor relaxes when a person has a bowel movement and contracts when they hold stool back.
The brain and nerves work together to empty the bowel. The nerves in the mucous membrane lining of the anal canal send signals to the brain to help it recognize the consistency of the stool and how full the bowel is. These nerves also help an individual know when their bowel needs to be emptied. The primary nerve pathway that controls bowel function is the enteric nervous system (ENS), a complex network of nerves present in the walls of the gastrointestinal tract. The ENS controls the wave-like contractions that push food through the gut, also known as peristalsis. It also regulates the opening and closing of the sphincters, which are the muscle bands that control the passage of food waste.
The spinal cord is the main pathway for nerve signals between the brain and the bowel. The cauda equina, a group of nerve roots at the lower end of the spinal cord, provides sensation and control of movement to the lower part of the body, including the bowel. Pudendal nerves, found on the left and right sides of the body within the pelvis, affect fecal and urinary control. Pelvic parasympathetic nerves, which begin at the sacral level of the spinal cord, stimulate the bladder and relax the urethra.
If the nerves around the rectum and anus are damaged, it can interfere with bowel control. This damage may reduce peristalsis in the muscles around the colon and block signals to or from the rectum and anus. This may result in constipation, stool leakage, and unplanned bowel movements.
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Exercises to strengthen the pelvic and rectal muscles
The pelvic floor is a group of muscles that forms a "hammock" at the bottom of the pelvis. These muscles, along with the anal sphincters, support the pelvic organs and control bowel movements. Weak pelvic floor muscles can cause leaking during bowel movements and difficulty in controlling them.
Pelvic floor exercises can help strengthen these muscles and improve overall pelvic health. Here are some exercises to strengthen the pelvic and rectal muscles:
- Kegel exercises: Kegels are a well-known type of pelvic floor exercise. They involve tightening and then releasing the muscles in your pelvic floor. To find your pelvic floor muscles, try stopping the flow of your urine while sitting on the toilet. You can also imagine trying to prevent yourself from passing gas. The muscles you feel engaging during these activities are the ones you strengthen during Kegel exercises.
- Pelvic tilts: Pelvic tilts help strengthen your lower back and abdominal muscles, contributing to pelvic floor stability. Lie on your back with your knees bent and feet flat on the floor. Tighten your abdominal muscles and press your lower back into the floor. Hold for a few seconds, then release. Repeat this movement 10-15 times, gradually increasing the repetitions as your muscles strengthen.
- Bird-dog exercise: This exercise activates multiple muscle groups, including the pelvic floor. Start on your hands and knees, aligning your wrists under your shoulders and your knees under your hips. Keep your back straight and engage your core muscles while retracting your shoulder blades down toward your hips. Simultaneously extend and raise your left leg and right arm, maintaining a neutral body position. Hold this position for a few seconds.
- Happy Baby Pose: This pose is great for stretching and releasing the pelvic floor muscles. Lie on the floor with your knees bent and bring your knees toward your belly at a 90-degree angle, with the soles of your feet facing up. Grab the outside or inside of your feet and open your knees wider than your torso. Then, bring your feet up toward your armpits, ensuring your ankles are over your knees. Flex your heels and push your feet into your hands.
It is important to note that you should focus on isolating and contracting your pelvic floor muscles without clenching your buttocks during these exercises. Additionally, consulting a healthcare professional before starting a new exercise routine is always recommended. They can help identify the right exercises for your specific needs and advise on the frequency and duration of the workouts.
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Biofeedback therapy to train your muscles to relax and push effectively
The pelvic floor is a group of muscles that forms a "hammock" at the bottom of the pelvis. These muscles, along with the anal sphincters, close off the bowel, preventing stool from leaving the body. The pelvic floor relaxes when you have a bowel movement and contracts when you hold stool back.
Biofeedback therapy is an alternative medicine approach that teaches you to change the way your body functions. It is a mind-body therapy that may improve your physical and mental health. During a biofeedback session, electrodes or finger sensors are attached to your skin to send signals to a monitor. This monitor displays a sound, flash of light, or image that represents your heart and breathing rate, blood pressure, skin temperature, sweating, or muscle activity. When you're under stress, these functions change, and you can see these stress responses as they happen on the monitor. You then get immediate feedback as you try to stop them.
Biofeedback therapy can help people who have trouble controlling the urge to use the bathroom. It can help women find and strengthen the pelvic floor muscles that control bladder emptying. After several sessions of biofeedback, women with incontinence may be able to reduce their urgent need to urinate and the number of accidents they have. It can also help children who wet the bed and people with fecal incontinence (the inability to control bowel movements).
Several different relaxation exercises are used in biofeedback therapy, including guided imagery and mindfulness meditation. As you slow your heart rate, lower your blood pressure, and ease muscle tension, you'll get instant feedback on the screen. Eventually, you'll learn how to control these functions on your own, without the biofeedback equipment.
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Frequently asked questions
The pelvic floor muscles are the "poop muscles". They form a "hammock" at the bottom of your pelvis.
The pelvic floor muscles, when well-toned, ensure the anus remains closed until it's time to go to the toilet. They relax and contract to allow for bowel movements.
If you have weak pelvic floor muscles, you may experience bowel dysfunction, such as anismus (dyssynergic defecation), which can cause constipation. Pelvic floor therapy can help with this.
If you are straining during bowel movements, tightening your pelvic floor muscles and closing off the anus, this could be a sign of weak pelvic floor muscles.
