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The psoas muscle is a long, ribbon-shaped muscle located deep in the body on either side of the spine. It starts in the lower back, just below the ribs, and runs alongside the spine through the pelvis to the top of the femur (thigh bone) near the groin. The psoas muscle is one of the core muscles and plays an important role in back health and stability. It is involved in various movements that require the use of the back, belly, and legs simultaneously, such as standing, walking, climbing, and running. Psoas injuries are rare due to their deep location, but certain activities and health conditions can irritate the psoas muscle, causing symptoms such as lower back pain.
| Characteristics | Values |
|---|---|
| Shape | Long and ribbon-shaped |
| Length | Around 16 inches |
| Ends | Lower back and groin |
| Location | Deep inside the body, on either side of the spine |
| Function | Stabilizer muscles in the inner core, connecting the upper and lower body |
| Composition | Thousands of tiny fibres woven together |
| Blood supply | Four lumbar arteries from the aorta, small branches of the renal arteries, small muscular branches of the common iliac artery, and the deep circumflex iliac artery |
| Injuries | Rare, but can be irritated in athletes whose sports put a lot of force on their cores or hips |
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What You'll Learn
- The psoas muscle is a long, ribbon-shaped muscle that runs from the lower back to the groin
- It starts at the lower back, just below the ribs, and ends at the top of the femur
- There is one psoas muscle on either side of the spine
- The psoas muscle is a core muscle and is essential for correct posture and stability
- Psoas syndrome is a rare condition that occurs when the psoas muscle is irritated or injured
The psoas muscle is a long, ribbon-shaped muscle that runs from the lower back to the groin
The psoas muscle is a long, ribbon-shaped muscle that is located deep inside the body on either side of the spine. It runs from the lower back, just below the ribs, through the pelvis, and ends in the groin near the hips. It is one of the core muscles in the abdomen and plays a crucial role in back health and stability.
The psoas muscle is essential for maintaining correct lumbar posture and stability of the hip joint during walking and running. It also assists with lateral motions, such as trunk elevation when transitioning from a supine to a sitting or standing position. The muscle is involved in flexing and rotating the hip and laterally flexing the lumbar spine.
The psoas muscle has two segments, one on each side of the body, allowing it to assist with both unilateral and bilateral motions. For example, unilateral contraction of the psoas muscle results in flexion of the lumbar spine, while bilateral contraction aids in trunk elevation. The muscle is connected to the nerves in the lumbar spine, as well as the femoral nerves, which provide sensation to the thighs and quadriceps muscles.
Psoas injuries are rare due to their deep location within the body. However, athletes who participate in sports that involve significant force on the core or hips are more susceptible to psoas injuries, particularly strains. Psoas syndrome is a rare condition that can cause lower back pain and is often misdiagnosed. It is important to maintain a safe and neutral posture to keep the psoas muscles relaxed and prevent injuries.
The psoas muscle is a vital component of the human body, facilitating various movements and providing stability to the lumbar region and hips. Its length and strategic position enable it to connect the upper and lower body, contributing to our ability to perform daily activities with ease.
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It starts at the lower back, just below the ribs, and ends at the top of the femur
The psoas muscle (pronounced so-ezz) is a long, ribbon-shaped muscle in the lower back, just below the ribs. It is one of the core muscles in the abdomen. There is one psoas muscle on either side of the spine, and they are the main muscular connection between the torso and the lower body.
The psoas muscle starts in the lower back, just below the ribs, and runs alongside the spine through the pelvis. It ends in the groin, near the hips, at the top of the femur. The muscle fibres converge to form a long tendon, which inserts into the lesser trochanter of the femur. The psoas muscle combines with the iliacus muscle to form the iliopsoas muscle group.
The psoas muscle is involved in several important functions. It helps to stabilise the femoral head within the acetabulum of the hip during movement. It also assists with flexion and external rotation of the hip. When standing upright, unilateral contraction of the psoas muscle will yield flexion of the lumbar spine, with simultaneous contralateral rotation. For example, a contraction of the left psoas muscle will yield side bending towards the left with rotation to the right.
The psoas muscle is also involved in metabolic function and can play a role in mood and stress disorders as a cause of low back pain. It is important to stretch and warm up before exercise to prevent psoas muscle injuries. Sitting or moving in a safe, neutral posture can also help to keep the psoas muscles relaxed.
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There is one psoas muscle on either side of the spine
The psoas muscle is a long, ribbon-shaped muscle located deep inside the body. There is one psoas muscle on either side of the spine, starting in the lower back just below the ribs and running alongside the spine through the pelvis. The psoas muscle is one of the core muscles in the abdomen and is essential for maintaining correct lumbar posture and stability of the hip joint. It also plays a crucial role in dynamic and postural functions, providing simultaneous support for both static and dynamic movements.
The psoas muscle combines with the iliacus muscle to form the iliopsoas muscle, which is encircled by the dense iliac fascia. This combination occurs closer to the insertion point, which is the lesser trochanter of the femur. The iliopsoas muscle group is responsible for the external rotation and abduction of the femur. The psoas muscle itself assists with flexion and external rotation of the hip, as well as lateral flexion of the lumbar spine.
The psoas muscle has two segments, one on each side of the body, allowing it to facilitate both unilateral and bilateral motions. For example, during a unilateral contraction, the left psoas major contraction will yield side bending towards the left with simultaneous rotation to the right. The psoas muscle also stabilizes the femoral head within the acetabulum of the hip during the initial 15 degrees of movement.
The psoas muscle is among the most significant muscles that overlie the vertebral column. It plays a crucial role in back health due to its proximity to the lumbar vertebrae. The muscle receives its blood supply from various arteries, including the lumbar arteries, renal arteries, common iliac artery, and deep circumflex iliac artery. The psoas muscle is also connected to the femoral nerves, which provide sensation to the thighs and quadriceps muscles.
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The psoas muscle is a core muscle and is essential for correct posture and stability
The psoas muscle is a long, ribbon-shaped muscle located deep in your core, on either side of the spine. It starts in the lower back, just below the ribs, and runs alongside the spine through the pelvis to the groin near the hips and the top of the femur. It is one of the most significant muscles that overlie the vertebral column.
The psoas muscle is essential for correct posture and stability. It helps maintain posture and move the hips and upper legs. Sitting or moving in a safe, neutral posture is usually all you need to do to keep your psoas muscles relaxed. Walking is a great way to help your body relax and return to a neutral posture, especially if you've been sitting still for a long time. Excessive periods of sitting can shorten the psoas muscle, causing myofascial pain, low back pain, and difficulty maintaining a standing position.
The psoas muscle has a biomechanical and postural function during both moving and static states. It also stabilizes the femoral head within the acetabulum of the hip in the first 15 degrees of movement. The psoas muscle has traditionally been described as having deep and superficial segments. The deeper segment of the muscle originates from the first four lumbar vertebrae, while the superficial segment originates along the lateral surface of the distal thoracic vertebrae and from adjacent intervertebral discs. In between these layers is the lumbar plexus.
The psoas muscle also has an important role in dynamic function and simultaneous static (postural) function. At the site of its origin, there are more anaerobic fibres present for static (postural) function. Closer to the insertion point, there are more aerobic fibres to assist with dynamic function. The muscle receives blood from the four lumbar arteries from the aorta, from small branches of the renal arteries, and from small muscular branches of the common iliac artery.
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Psoas syndrome is a rare condition that occurs when the psoas muscle is irritated or injured
The psoas muscle is a long, ribbon-shaped muscle that runs from the lower back to the top of the hips or femur (thigh bone). There is one psoas muscle on either side of the spine. The psoas muscle is a core muscle that helps move the hips and upper legs and supports posture.
The syndrome can be challenging to diagnose as the area around the spine in the lower back and hips is a complex network of muscles, nerves, and joints. Symptoms of psoas syndrome may overlap with other conditions, such as arthritis or sacroiliitis, further complicating diagnosis. A healthcare provider will typically perform a physical examination and may use diagnostic tools such as magnetic resonance imaging (MRI), electromyography (EMG), or an ultrasound to confirm the condition.
Treatment for psoas syndrome typically involves rest and physical therapy to help manage pain and improve strength and flexibility in the affected area. It is important to allow the psoas muscle to heal completely before resuming intense physical activities.
Although rare, malignant psoas syndrome can occur, and metastatic spread to the psoas muscle must be considered during diagnosis.
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Frequently asked questions
The SOAS muscle is a common misnomer for the psoas muscle, which is located in the lower back.
The psoas muscle is long and ribbon-shaped, with a slightly triangular shape.
The psoas muscle is a core muscle that helps to connect the upper and lower body. It joins the spine to the pelvis and thigh bones, aiding in movements that use the back, belly, and legs simultaneously.
Psoas injuries are rare, but they can occur in athletes whose sports involve a lot of force on the core or hips. Psoas syndrome can cause lower back pain and stiffness, and symptoms can mimic those of other conditions like arthritis or sacroiliitis. If you experience persistent symptoms for over a week, it is recommended to consult a healthcare provider.
