Dominic Stone
The abdominal muscles are a group of muscles that line the walls of the abdomen, supporting the trunk, allowing movement, and holding organs in place. They are located between the ribcage and the pelvis at the front of the body. There are five main abdominal muscles: the pyramidalis, rectus abdominis, external obliques, internal obliques, and transversus abdominis. These muscles work together to provide postural support, increase intra-abdominal pressure, and protect the internal organs. The abdominal muscles are relatively thin structures, and their appearance can be affected by factors such as low belly fat and exercise.
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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 have many important functions, including holding internal organs in place, supporting the body during movement, maintaining posture, and providing core support.
There are five main abdominal muscles: the pyramidalis, rectus abdominis, external obliques, internal obliques, and transversus abdominis. 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 a muscle called the linea alba, and they hold internal organs in place, keeping the body stable during movement. The rectus abdominis may form bumps sometimes called a "six-pack" when someone has a trim, fit abdomen.
The pyramidalis is a small, triangular-shaped vertical muscle located at the base of the pubic bone. It helps maintain internal pressure in the abdomen, though about 20% of people do not have this muscle. The external obliques are a pair of muscles, one on each side of the rectus abdominis, and are the largest of the flat muscles. They run from the sides of the body towards the middle and allow the trunk to twist from side to side.
The internal obliques are a pair of muscles that sit on top of the external obliques, just inside the hip bones. They are much thinner and smaller than the external obliques but work together with them to allow the trunk to twist and turn. The transversus abdominis is the deepest muscle layer and its main roles are to stabilise the trunk and maintain internal abdominal pressure.
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Functions of the abdominal muscles
The abdominal muscles, or abs, have many important functions. They support the trunk, allow movement, hold organs in place, and are distensible. They also help to keep the body stable and balanced, and protect the spine.
The abdominal muscles are strong bands of muscles lining the walls of the abdomen (the trunk of the body). They are located towards the front of the body, between the ribcage and the pelvis.
The abdominal muscles are made up of five main muscles: pyramidalis, rectus abdominus, external obliques, internal obliques, and transversus abdominis. The rectus abdominis holds the internal organs in place and keeps the body stable during movement. It may form bumps sometimes called a "six-pack" when someone has a trim, fit abdomen. The pyramidalis is a small, triangular muscle located at the base of the pubic bone. It helps maintain internal pressure in the abdomen. The external obliques are the largest of the flat muscles and sit at the bottom of the stack. They allow the trunk to twist from side to side. The internal obliques are much thinner and smaller than the external obliques. They work with the external obliques to allow the trunk to twist and turn. The transversus abdominis is the deepest muscle layer. It helps to stabilise the trunk and maintain internal abdominal pressure.
The abdominal muscles work together with the back muscles to form the core muscles. They help to protect the spine and keep the body stable and balanced. They also help to regulate internal abdominal pressure, which is critical for essential bodily functions like breathing, coughing, vomiting, and childbirth.
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Anterolateral abdominal wall
The abdominal wall is a complex organ that encloses the abdominal cavity and can be divided into anterolateral and posterior sections. The anterolateral abdominal wall is a large structure that spans the anterior and lateral sides of the abdomen. It is made up of multiple layers of skin, connective tissue, and muscles, which require a rich blood supply.
The anterolateral abdominal wall consists of four main layers (from external to internal): skin, superficial fascia, muscles and associated fascia, and parietal peritoneum. The muscles of the anterolateral abdominal wall can be divided into two main groups: flat muscles and vertical muscles. There are three flat muscles, situated laterally on either side of the abdomen, and two vertical muscles, situated near the midline of the body.
The three flat muscles are the external oblique, internal oblique, and transversus abdominis. The external oblique is the largest and most superficial flat muscle in the abdominal wall, with its fibres running inferomedially. It originates from ribs 5-12 and inserts onto the iliac crest and pubic tubercle. The internal oblique lies deep to the external oblique and is smaller and thinner in structure, with its fibres running superomedially. It originates from the inguinal ligament, iliac crest, and lumbodorsal fascia and inserts onto ribs 10-12.
The two vertical muscles are the rectus abdominis and pyramidalis. The rectus abdominis is a long, paired muscle, found on either side of the midline in the abdominal wall. It is split into two by the linea alba, with the lateral borders creating a surface marking known as the linea semilunaris. It originates from the crest of the pubis bone and inserts onto the xiphoid process of the sternum and the costal cartilage of ribs 5-7. The pyramidalis is a small, triangular muscle located at the base of the pubic bone.
The main functions of the anterolateral abdominal muscles include the stabilisation of the vertebral column, movement of the trunk, and the tensioning of the abdominal wall. The function of the anterolateral wall as a whole includes the protection of the abdominal viscera, maintenance of the anatomical position, assistance in forceful expiration, and involvement in any activity that increases intra-abdominal pressure.
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Posterior abdominal wall
The abdominal wall surrounds the abdominal cavity, providing flexible coverage and protecting the internal organs from damage. It is bounded by the xiphoid process and costal margins superiorly, the vertebral column posteriorly, and the pelvic bones and inguinal ligament inferiorly. The abdominal wall can be divided into two sections: the anterolateral abdominal wall and the posterior abdominal wall. The posterior abdominal wall is a complex region of anatomy, consisting of muscles, vessels, and nerves that work together to hold abdominal organs in place, adjust posture, stabilise the hip joint, and flex the thighs.
There are five muscles in the posterior abdominal wall: the iliacus, psoas major, psoas minor, quadratus lumborum, and the diaphragm. The iliacus muscle is fan-shaped and situated inferiorly on the posterior abdominal wall. It combines with the psoas major to form the iliopsoas, the major flexor of the thigh. The iliopsoas is responsible for the flexion and lateral rotation of the thigh at the hip joint. The psoas major is a long, thick muscle located near the midline of the posterior abdominal wall, immediately lateral to the lumbar vertebrae. The psoas minor is only present in about half of the population and is located anterior to the psoas major.
The quadratus lumborum is a thick muscular sheet that is quadrilateral in shape and located laterally in the posterior abdominal wall. It originates inferiorly on the iliac crest and iliolumbar ligament and inserts superiorly on the medial half of the inferior border of the 12th rib and the tips of the lumbar transverse processes. The diaphragm is considered part of the posterior abdominal wall.
The posterior abdominal wall is supported by the 12th thoracic and all five lumbar vertebrae, along with their corresponding intervertebral discs. The lumbar plexus, femoral nerve, and muscles of the posterior abdominal wall are also important components of this complex anatomical region.
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Abdominal muscle strains
The abdominal muscles are essential for supporting the trunk, facilitating movement, and holding organs in place. However, they are susceptible to strains, which can be painful and debilitating. Abdominal muscle strains, also known as pulled stomach muscles, occur when the muscles in the abdominal region stretch excessively or tear due to overuse, injury, or poor conditioning. This condition commonly affects athletes, particularly in sports like football, tennis, baseball, hockey, and soccer, which involve repetitive movements, reaching, and side-to-side trunk motions.
Anyone can experience an abdominal muscle strain, and it can affect various areas, including the left side, right side, lower abdomen, or upper abdomen. The main symptom of an abdominal strain is abdominal pain, which may be felt during activities such as coughing, sneezing, laughing, sprinting, or vigorous exercise. The pain may be localized to the immediate area of the injury or radiate to a wider region, including the back, hip, or groin. In some cases, muscle spasms, stiffness, and muscle pain may also be present.
To diagnose a pulled stomach muscle, a healthcare provider will consider the symptoms and perform a physical examination. X-rays may be recommended to rule out any rib cage injuries, spinal fractures, or broken bones. Abdominal muscle strains are typically graded as mild, moderate, or severe, depending on the level of discomfort and the impact on daily activities.
Treatment for an abdominal muscle strain focuses on rest, ice, compression, and elevation. Finding a comfortable position that relaxes the muscle is crucial. Applying ice for 10 to 15 minutes every hour during the initial stage of treatment is essential, gradually reducing the frequency as healing progresses. Warm compresses can also provide relief. NSAID drugs, such as aspirin, ibuprofen, or naproxen, can help manage pain and reduce inflammation. Additionally, wearing an abdominal brace can provide support and reduce swelling. Most people with this injury heal within a few weeks, but severe strains can take six weeks or longer to recover fully.
To prevent abdominal muscle strains, it is important to strengthen the abdominal and core muscles. This can be achieved through core-strengthening exercises, such as yoga, Pilates, or planks. Proper warm-up routines before exercise and cool-down periods afterward are crucial. Maintaining good form while playing sports or lifting heavy objects is essential, and seeking assistance for lifting heavy items is recommended. Consulting a qualified fitness instructor or a skilled allied health professional can help develop a safe and effective exercise program.
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Frequently asked questions
The abdominal muscles are bands of muscles that line the walls of the abdomen (the trunk of the body). They are located between the ribcage and the pelvis at the front of the body.
There are five main types of abdominal muscles: pyramidalis, rectus abdominus, external obliques, internal obliques, and transversus abdominis.
The rectus abdominis is a pair of segmented skeletal muscles that extend from the pubic bone to the ribs. They hold internal organs in place and keep the body stable during movement. They are also known as the "sit-up muscles" and can form the appearance of a "'six-pack' when an individual has a trim, fit abdomen.
The external and internal oblique muscles are flat muscles that allow the trunk to twist and turn. The external obliques are the largest of the flat muscles and are located at the bottom of the stack, running from the sides of the body towards the middle. The internal obliques are much thinner and smaller and are located just inside the hip bones.
