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The abdominal muscles are bands of muscles lining the walls of the abdomen, which is the trunk of the body. They are located between the ribs and the pelvis at the front of the body. There are five main abdominal muscles: pyramidalis, rectus abdominis, external obliques, internal obliques, and transversus abdominis. These muscles have many important functions, including holding organs in place, supporting the body during movement, and protecting the spine. Abdominal muscles are often targeted in exercise programs and can be strengthened through specific techniques such as Pilates and core strengthening exercises.
| Characteristics | Values |
|---|---|
| Number of abdominal muscles | 5 |
| Location | Between the ribs and the pelvis |
| Function | Holding organs in place, supporting the trunk, allowing movement, protecting the spine, maintaining internal pressure in the abdomen, regulating internal abdominal pressure, assisting in exhalation, protecting the inner organs, providing postural support, defining the body form |
| Muscle names | Rectus abdominis, pyramidalis, external obliques, internal obliques, transversus abdominis |
| Muscle shape | Rectus abdominis: long and flat; Pyramidalis: small and triangular; External obliques: flat; Transversus abdominis: flat and triangular |
| Muscle position | Rectus abdominis: down the middle of the abdomen, from ribs to pelvis; Pyramidalis: at the base of the pubic bone, in front of the rectus abdominis; External obliques: one on each side of the rectus abdominis; Internal obliques: flank the rectus abdominis, just inside the hipbones; Transversus abdominis: the deepest muscle layer |
| Muscle function | Rectus abdominis: holds internal organs in place, stabilises the body during movement; Pyramidalis: maintains internal abdominal pressure; External obliques: allow the trunk to twist; Internal obliques: allow the trunk to twist; Transversus abdominis: supports lumbopelvic stability, protects against back injury or strain, increases spine stability |
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What You'll Learn
The five main abdominal muscles
The abdominal muscles are the muscles forming the abdominal walls, which connect the thorax and pelvis. They are strong bands of muscles lining the walls of the abdomen, which is located at the front of the body, between the ribs and the pelvis. The abdominal muscles are also known as the "'core'" muscles, as they work with the back muscles to protect the spine and keep the body stable and balanced.
There are five main abdominal muscles:
- Pyramidalis: This is a small, triangular vertical muscle located at the base of the pubic bone. It sits in front of the rectus abdominis and attaches to the linea alba. The pyramidalis helps maintain internal pressure in the abdomen. Interestingly, about 20% of people do not have this muscle.
- Rectus abdominis: This pair of muscles runs down either side of the middle of the abdomen, from the ribs to the front of the pelvis. They are divided into two segments by the muscle called the linea alba. The rectus abdominis holds the internal organs in place and keeps the body stable during movement. This muscle may form bumps sometimes called a "six-pack" when an individual has a trim and fit abdomen.
- External obliques: The external obliques are a pair of muscles, with one on each side of the rectus abdominis. They are the largest of the flat muscles and sit at the bottom of the stack. These muscles allow the trunk to twist from side to side.
- Internal obliques: The internal obliques are another pair of muscles, located on top of the external obliques, just inside the hip bones. They are much thinner and smaller than the external obliques. They operate in the opposite way to the external obliques, for example, twisting the trunk to the left requires the left internal oblique and the right external oblique to contract together.
- Transversus abdominis: This is a deep abdominal muscle and one of the most important core muscles. It contributes to supporting lumbopelvic stability, and a deficit in its function can cause low back pain.
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Their function
The abdominal muscles are located between the ribs and the pelvis at the front of the body. They are strong bands of muscles lining the walls of the abdomen (the trunk of the body).
The abdominal muscles, together with the back muscles, make up the body's core muscles. They have many important functions, including:
- Supporting the trunk and keeping the body stable and balanced.
- Protecting the spine.
- Holding internal organs in place.
- Regulating internal abdominal pressure.
- Assisting with movement, including bending and rotating the trunk.
- Assisting with essential bodily functions such as breathing, coughing, vomiting, and childbirth.
- Preventing hyperextension.
- Pulling up the pelvis and lower limbs when the thorax is fixed.
- Bending the vertebral column sideways.
The abdominal muscles are involved in almost all actions, from biking and running to playing chess. They are also important in physiotherapy and rehabilitation programs, as well as in Pilates and other forms of exercise.
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Their location
The abdominal muscles are located between the ribs and the pelvis, at the front of the body. They line the walls of the abdomen, which is the trunk of the body. The abdominal muscles are composed of three flat muscular sheets, from the outside in: the external oblique, the internal oblique, and the transverse abdominal. The first three layers extend between the vertebral column, the lower ribs, the iliac crest, and pubis of the hip. All of their fibres merge towards the midline and surround the rectus abdominis in a sheath before joining up on the opposite side at the linea alba.
The rectus abdominis is a pair of muscles that run down either side of the middle of the abdomen, from the ribs to the pelvis. They are divided into two segments by the linea alba. The rectus abdominis is enclosed in a thick sheath, formed by fibres from each of the three muscles of the lateral abdominal wall. They originate at the pubis bone and run up the abdomen on either side of the linea alba.
The external obliques are a pair of muscles, one on each side of the rectus abdominis. They are the largest of the flat muscles and sit at the bottom of the stack. The internal obliques flank the rectus abdominis and are located just inside the hipbones. The transverse abdominal is the deepest muscle layer. It is flat and triangular, with its fibres running horizontally. It lies between the internal oblique and the underlying transverse fascia.
The pyramidalis is a small, triangular muscle located in the lower abdomen, in front of the rectus abdominis. It sits at the base of the pubic bone and attaches to the linea alba. About 20% of people do not have this muscle.
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Common abdominal injuries
Abdominal muscles are strong bands of muscles lining the walls of the abdomen, located towards the front of the body between the ribs and the pelvis. They help protect the spine, keep the body stable and balanced, and support the trunk during movement.
Abdominal injuries are common and can be caused by various activities, including sports, road traffic accidents, and assaults. Abdominal trauma is an injury to the abdomen, and it can involve damage to the abdominal organs, such as the liver, spleen, pancreas, and kidneys. Here are some of the most common abdominal injuries:
Blunt Abdominal Trauma
Blunt abdominal trauma is a common type of injury that can result from motor vehicle accidents, falls in older adults, and assaults. It involves a sudden impact to the abdomen without any penetration of the skin. Symptoms of blunt abdominal trauma include abdominal pain, tenderness, rigidity, and bruising. Diagnosis may involve ultrasonography, computed tomography (CT scan), and peritoneal lavage. Treatment depends on the patient's stability and the results of the CT scan. In some cases, non-surgical treatments such as angiography and embolization therapy may be used to control hemorrhage. However, in severe cases, especially when there is bleeding or organ damage, immediate laparotomy or emergency surgery may be required.
Abdominal Muscle Strains
Abdominal muscle strains are common injuries that can occur during physical activities or sports. Treatment of abdominal muscle strains can be challenging because it is difficult to rest these muscles completely. Recommendations for managing abdominal muscle strains include avoiding exercises or activities that cause pain or spasms, gentle stretching, and applying ice during the acute phase and after activities. Heat can also be applied before activities to loosen the muscles.
Inguinal Hernias
Inguinal hernias are another common abdominal injury, especially in males. They occur when the testes descend out of the abdominal cavity through its wall into the scrotum, leaving a potentially weak area where the hernia can develop. Inguinal hernias can cause a bulge in the groin area and may require surgical repair if they become painful or incarcerated (trapped in the abdominal wall).
Organ Injuries
Injuries to the abdominal organs can have serious consequences. For example, the liver is the most vulnerable organ due to its size and location, and liver injuries can lead to bleeding and shock. The spleen is also commonly injured in abdominal trauma and can cause massive bleeding, which can be life-threatening. Pancreatic injuries, often caused by bicycle or vehicular accidents, and kidney injuries are also possible in abdominal trauma and can have severe complications.
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Training abdominal muscles
The abdominal muscles, also known as "abs", are located in the trunk of your body, between your ribs and your pelvis. They are strong bands of muscles lining the walls of your abdomen and help hold your organs in place, support your body during movement, and protect your spine.
There are five main abdominal muscles:
- Pyramidalis: This is a small, triangular muscle located at the base of your pubic bone. It helps maintain internal pressure in your abdomen.
- Rectus abdominis: This pair of muscles runs down the middle of your abdomen, from your ribs to your pelvis. They are responsible for holding your internal organs in place and keeping your body stable during movement.
- External obliques: These are the largest of the flat abdominal muscles, sitting at the bottom of the stack. They allow your trunk to twist.
- Internal obliques: These flank the rectus abdominis and are located just inside the hipbones. They work in opposition to the external obliques to twist the trunk.
- Transversus abdominis: This is a deep abdominal muscle that wraps around the spine and helps stabilise your core.
To effectively train your abdominal muscles, you should incorporate various exercises that target both sets of ab muscles: the rectus abdominis and the transverse abdominis. Here are some specific exercises and tips to help you train your abdominal muscles:
- Plank poses and their variations (side plank, back leg lifts) are very effective in tightening your tummy. Start by lying on your stomach, then raise your body weight onto your toes and forearms or hands in a "plank" position. Hold this pose for as long as you can.
- Lunges are excellent all-body toners, especially for your core muscles. Stand with your feet hip-width apart, then step forward into a lunge position, keeping your back knee slightly off the ground. You can increase the intensity by adding small dumbbells.
- The bicycle motion works both sets of ab muscles. Lie down on a mat, place your hands behind your head, and bring your knee up to your chest while rotating your upper body to meet your knee with the elbow of your opposite arm. Keep your neck relaxed and switch sides, "cycling" your legs. Aim for 1-3 sets of 12-16 repetitions each.
- Russian twists are a great ab workout. Sit up tall, slightly lean back, and engage your core. You can add a medicine ball to increase the challenge.
- Abdominal draw-in exercises target the transversus abdominis and are important for respiratory health.
- To target the rectus abdominis, perform regular sit-ups or try "the 100", a modified crunch that you hold for 100 counts.
- Boxing is a solid option for overall fitness and targets both sets of ab muscles.
- Pilates targets your core muscles and works your abdominals in repetitive exercises.
Remember, achieving visible "six-pack abs" requires losing the layer of fat over your abdominal muscles. This can be accomplished through frequent cardio workouts and a healthy diet. Additionally, it's important to gradually progress your abdominal exercises, starting with learning how to activate and maintain muscle contraction before integrating them with functional movements.
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Frequently asked questions
Abdominal muscles are bands of muscles lining the walls of the abdomen (the trunk of the body). There are five main abdominal muscles: pyramidalis, rectus abdominus, external obliques, internal obliques, and transversus abdominis.
Abdominal muscles have many functions, including holding organs in place, supporting the body during movement, and protecting the spine. They also regulate internal abdominal pressure and help with breathing, coughing, urination, defecation, childbirth, and vomiting.
Rectus abdominis is a pair of muscles that run down the middle of the abdomen on either side. They are long and flat and are responsible for holding internal organs in place and keeping the body stable during movement. The pyramidalis muscle, on the other hand, is small and triangular and is located in the lower abdomen in front of the rectus abdominis. It helps maintain internal abdominal pressure.
Abdominal exercises like Pilates, stability ball exercises, and core strengthening techniques can help improve abdominal strength. It is important to consult a qualified fitness instructor or a health professional to develop a safe and effective exercise program.
