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The psoas muscles are two long, ribbon-shaped muscles that sit on either side of the spine, connecting the torso to the lower body. They are located deep inside the body, starting at the lower back and running through the pelvis to the top of the femur (thigh bone). The psoas muscles work with other muscles in the body to help make motions that use the back, belly, and legs simultaneously, such as standing, walking, and climbing. They also play an important role in back health and posture.
| Characteristics | Values |
|---|---|
| Location | Deep in the hip |
| Length | Around 16 inches |
| Shape | Triangular |
| Function | Helps in walking, maintaining posture, moving the lower back, hips, and upper legs |
| Composition | Thousands of tiny fibres |
| Connected body parts | Spine, lower body, muscles deep inside the body, muscles closer to the skin, lumbar spine, femoral nerves, hip joint capsule |
| Related health conditions | Lower back pain, hip pain, Crohn's disease, irritable bowel syndrome (IBS), Diverticulitis, Perforated colon, Colorectal cancer |
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What You'll Learn
The psoas muscle is located deep in the body
The psoas muscle is part of a group of muscles called the hip flexors, which are responsible for lifting the upper leg towards the body or pulling the body towards the leg. It also plays a role in flexion in the hip joint, bending the trunk laterally when contracted unilaterally, and raising the trunk from a supine position when contracted bilaterally.
The psoas muscle is made up of thousands of tiny fibres that stretch and press together to enable movement. It has a slightly triangular shape, with the top in the lower back being thinner than the bottom, which connects to the hips. The psoas major, one of the two parts of the psoas muscle, is divided into a superficial and a deep part. The deep part originates from the lumbar vertebrae, while the superficial part originates from the lumbar vertebrae and the neighbouring intervertebral discs.
The psoas muscle is important to consider when treating low back pain or hip pain. Injuries to the psoas muscle are rare due to its deep location, but they can occur, especially in athletes whose sports involve a lot of force on the core or hips. Psoas syndrome is a rare condition that occurs when the psoas muscle is irritated. To prevent and treat tightness in the psoas muscle, stretching and strengthening exercises are recommended.
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It starts at the lower back
The psoas muscle is a long, ribbon-shaped muscle in the lumbar region of the back. It starts at the lower back, close to the spine, and runs through the pelvis to the top of the femur (thigh bone). There is one psoas muscle on either side of the spine, extending from the lower spine down through the hips.
The psoas muscle is a paraspinal muscle, located deep inside the body. It is one of the core muscles in the abdomen, and it plays an important role in back health and posture. The psoas muscle helps to stabilise the lumbar spine, especially when sitting, and assists with flexion and external rotation of the hip. It is also essential for correct lumbar posture when standing or sitting, as well as for the stability of the hip joint.
The psoas muscle is closely connected to the iliacus muscle, with which it forms the iliopsoas muscle. The iliopsoas muscle passes under the inguinal ligament and fills the space between the ligament, the iliopectineal band, and the anterior border of the iliac bone. The iliopsoas tendon lies deep beneath several muscles and the deep femoral artery.
The psoas muscle is susceptible to strain and tightness, which can cause lower back pain and pelvic pain. Psoas syndrome is a rare condition that occurs when the psoas is irritated, often without a known cause. It is important to visit a healthcare provider if you are experiencing back pain, stiffness, or other symptoms that last for more than a week. Treatment for psoas syndrome typically involves physical therapy, stretching, and strengthening exercises.
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It runs through the pelvis
The psoas muscle is a long, fusiform muscle located in the lateral lumbar region between the vertebral column and the brim of the pelvis. It is part of the iliopsoas muscle, which is a combination of the psoas major and iliacus muscles. The psoas muscle has a slightly triangular shape, with its top at the lower back being thinner than its bottom, which connects to the hips.
The psoas muscle plays a crucial role in everyday activities, including walking, running, and maintaining a healthy posture. It helps to move the lower back, hips, and upper legs, and works with other muscles to stabilize posture and facilitate movement. When walking, the psoas muscle moves the back leg forward, initiating the alternation between the front and back legs. It also helps to flex and move the hips when standing or lying down.
The psoas muscle is located deep within the body, running through the pelvis and connecting the spine to the lower body. It is attached to the lesser trochanter, located on the posteromedial aspect of the femur, which causes lateral rotation and weak adduction of the hip. The psoas muscle is also connected to the lumbar spine and femoral nerves, which provide sensation to the muscle.
Due to its location and function, the psoas muscle can be susceptible to tightness, especially when sitting for extended periods. This tightness can pull the pelvis forward, placing pressure on the lumbar spinal discs and often resulting in lower back pain. However, this can be prevented or treated with simple stretches that target the psoas muscle.
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It connects to the thigh bone
The psoas muscle is a long, ribbon-shaped muscle located in the lumbar region of the back. There is one psoas muscle on each side of the spine, and they are essential for walking and maintaining a healthy posture. The psoas muscle connects to the thigh bone, or femur, at its distal end.
The distal end of the psoas muscle combines with the iliacus muscle to form the iliopsoas muscle, which attaches to the lesser trochanter of the femur. This attachment is encircled by the dense iliac fascia and separated from the hip-joint capsule by the iliopectineal bursa. The iliopsoas muscle fills the space between the inguinal ligament, the iliopectineal band, and the anterior border of the iliac bone, known as the lacuna musculorum.
The psoas muscle is deep within the body, originating from the lumbar vertebrae and extending through the pelvis to the femur. Its connection to the thigh bone allows for the external rotation and abduction of the femur, facilitating movement in the hips and upper legs. This connection also helps to stabilize the body during various motions and activities.
The psoas muscle is innervated by the lumbar spine nerves, including the lumbar plexus and femoral nerves, which provide sensation and movement. These nerves can become irritated or compressed, leading to lumbar neuralgias and symptoms such as a sensation of water or heat running down the thigh.
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It is one of the core muscles
The psoas muscle is one of the core muscles in the human body. Located deep in the hip, it is essential for everyday activities such as walking and maintaining a healthy posture. It is a long, fusiform muscle found in the lateral lumbar region between the vertebral column and the brim of the pelvis. The psoas major, one of the two parts of the psoas muscle, joins the iliacus muscle to form the iliopsoas. This muscle group is crucial for hip flexion and helps lift the upper leg towards the body or pull the body towards the leg.
The psoas muscle plays a vital role in stabilising posture and moving the hips and upper legs. It connects the spine to the lower body, acting as a bridge between the axial and appendicular skeleton. When sitting for extended periods, the psoas muscle may become tight, pulling the pelvis forward and causing pressure on the lumbar spinal discs, often resulting in lower back pain. Psoas syndrome is a rare condition that occurs when the psoas muscle is irritated.
Athletes who engage in sports that put a lot of force on their cores or hips are more prone to psoas muscle injuries, especially strains. The psoas muscle is connected to the lumbar spine and femoral nerves, allowing for sensation and movement in the lower back, hips, and legs. Its fibres stretch and press together to facilitate movement in these areas. The psoas muscle is also associated with the iliopsoas muscle, which is involved in hip flexion and can affect walking and running when weak.
To prevent and treat tightness in the psoas muscle, stretching and strengthening exercises are recommended. These exercises can help increase flexibility and improve muscle function. Overall, the psoas muscle is a crucial component of the body's core, enabling various movements and maintaining posture. Its health and proper function are essential for overall physical well-being.
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Frequently asked questions
The psoas muscles are two long, ribbon-shaped muscles located on either side of the spine in the lower back.
The psoas muscles are the main muscular connection between your torso and lower body, helping you to move your lower back, hips, and upper legs.
Psoas injuries are rare, but you should visit a healthcare provider if you experience lower back pain that doesn't go away after a week.
Treatment for psoas muscle pain can include physical therapy, stretching, and strengthening exercises.
Psoas syndrome is a rare condition that occurs when the psoas muscle becomes irritated, causing symptoms such as lower back pain and stiffness.
