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The spine is a flexible column that is supported by muscles that act like guy ropes. These muscles can be categorised into three main types: extensors, flexors, and obliques. Flexor muscles are attached to the front of the spine and enable actions such as bending forward, lifting, and arching the lower back. The rectus abdominis, external oblique abdominal muscles, internal oblique abdominal muscles, and psoas minor are all muscles that flex the spine.
| Characteristics | Values |
|---|---|
| Muscles that flex the spine | Rectus abdominis, external oblique abdominal muscles, internal oblique abdominal muscles, psoas major, psoas minor, erector spinae, multifidus, semispinalis, rotatores, spinal extensors, spinal flexors, abdominal muscles, oblique muscles, gluteal muscles, hamstring muscles |
| Muscle structure | Fascia, superficial fascia, epimysium, perimysium, endomysium |
| Muscle function | Flexion, extension, lateral flexion, rotation, bending, lifting, arching, tilting, pulling |
| Muscle groups | Transversospinalis, erector spinae, multifidus, semispinalis, rotatores, external abdominal oblique, internal abdominal oblique |
| Muscle movement | Cocontraction, contraction, stretching, gliding, widening, relaxing |
| Muscle-related issues | Back pain, muscle spasm, muscle weakness, muscle wasting, muscle imbalance, muscle tightness |
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What You'll Learn
- The multifidus is the largest muscle of the lumbar spine
- The psoas minor flexes the trunk at spinal joints
- The erector spinae extends, laterally flexes, and rotates the trunk
- The rectus abdominis, external and internal oblique abdominal muscles are spinal flexors
- The hamstrings can cause lower back pain
The multifidus is the largest muscle of the lumbar spine
The multifidus muscle is a long, narrow muscle that runs down both sides of the lumbar spine. It is the largest muscle of the lumbar spine and plays a crucial role in spinal stability and movement. Located just superficially to the spine, the multifidus spans three joint segments and stabilizes these joints at each level. This muscle helps to keep the spine stable and enables a wide range of movements.
The multifidus muscle has several attachment points, including the sacrum, the posterior superior iliac spine, and the mammillary processes of the lumbar vertebrae. These attachment points allow the multifidus to work in coordination with other muscles, such as the transversus abdominis and pelvic floor muscles, to stabilize the lumbar spine during standing or movement. The numerous attachment points also allow each spinal bone, or vertebra, to work individually and more efficiently.
One of the key functions of the multifidus is to provide stability to the lumbar spine. Its stiffness and stability make each vertebra work more effectively and help protect against spinal deterioration and arthritis. A strong multifidus muscle contributes to a stable spine, preventing spinal instability and vertebral compression. Weakness in the multifidus muscle can lead to back pain, spinal instability, and vertebral compression.
The multifidus muscle also helps with spinal movements, such as extending the lower spine during reaching or stretching. Bilateral contraction of the multifidus extends the vertebral column, while unilateral contraction rotates the vertebral column to the opposite side. Additionally, the multifidus muscle works with other deep muscle groups, such as the rotatores muscle, to enable unilateral rotation and bilateral rotation of the spine.
It is important to maintain the strength and health of the multifidus muscle to ensure spinal stability and prevent back pain. Specific exercises can target the multifidus muscle directly, such as lifts and extensions that engage the lower back muscles. Strengthening the core muscles also helps to strengthen the multifidus. Magnetic resonance imaging (MRI) can be used to assess the condition of the multifidus muscle and detect any atrophy or dysfunction.
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The psoas minor flexes the trunk at spinal joints
The psoas muscle is a core muscle that plays a crucial role in our body's functioning. It is a long, ribbon-shaped muscle that runs from the lower back to the groin on both sides of the spine. The psoas minor, in particular, is present in two out of three people and sits on top of the psoas major.
The psoas minor flexes the trunk at the spinal joints and is responsible for tilting the pelvis posteriorly at the lumbosacral joint. The psoas muscle group, in general, helps to stabilize the body's posture and move the hips and upper legs. They are essential for activities such as walking, climbing stairs, and maintaining a stable lumbar spine during functional movements.
The psoas muscle is also known as a hip flexor, as it assists in flexing and moving the hips, especially when transitioning from a supine to a sitting or standing position. This muscle group also helps to stabilize the femoral head within the hip joint and aids in external rotation of the hip.
The psoas muscle is susceptible to injury, especially with excessive sitting, which can cause the muscle to shorten. This can lead to low back pain, difficulty maintaining a standing position, and a change in lumbar spine curvature. Therefore, it is important to maintain flexibility and stretch the psoas muscle to prevent injuries and ensure optimal functioning.
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The erector spinae extends, laterally flexes, and rotates the trunk
The spine is a flexible column, and the muscles surrounding it act like guy ropes, working together to create a stable position and prevent the spine from falling in a particular direction. The erector spinae is a group of muscles in the lumbar spine of the trunk and pelvis that extends, laterally flexes, and rotates the trunk. It is composed of three subgroups: iliocostalis, longissimus, and spinalis. The erector spinae attaches from the sacrum, medial iliac crest, vertebral transverse and spinous processes, and angles of ribs to angles of ribs and transverse and spinous processes of vertebrae above.
The multifidus and rotatores of the transversospinalis group in the trunk lie within the laminar groove of the lumbar and thoracic spine. They also extend, laterally flex, and contralaterally rotate the trunk at the spinal joints. The multifidus is the largest muscle of the lumbar spine. It attaches from the sacrum and PSIS and the mammillary processes of the lumbar spine and transverse processes of the thoracic spine to the spinous processes of vertebral segments three to four levels superior to the inferior attachment.
The erector spinae and multifidus are extensors, which are attached to the back of the spine. Extensors help with actions like standing and lifting objects. The flexor muscles, on the other hand, are attached to the front of the spine and enable bending forward, lifting, and arching the lower back. The oblique muscles are attached to the sides of the spine and help rotate the spine and maintain proper posture.
The psoas minor flexes the trunk at the spinal joints and posteriorly tilts the pelvis at the lumbosacral joint. The rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles are also involved in spinal flexion. Spinal flexion occurs when the spine flexes or the pelvis posteriorly tilts against gravity or another external resistance.
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The rectus abdominis, external and internal oblique abdominal muscles are spinal flexors
The rectus abdominis, external oblique, and internal oblique abdominal muscles are spinal flexors. The rectus abdominis is the topmost layer of the abdominal muscles, commonly referred to as the "six-pack". It is composed of two flat, parallel muscles separated by connective tissue. This muscle flexes the spinal column, tenses the anterior wall of the abdomen, and assists in compressing abdominal content. It also works to posteriorly tilt the pelvis, along with other abdominal muscles.
The external oblique is the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen. It is broad, thin, and irregularly quadrilateral, with its muscular portion occupying the side and its aponeurosis occupying the anterior wall of the abdomen. The external oblique functions to pull the chest downwards, compressing the abdominal cavity and increasing intra-abdominal pressure. It also performs side-bending and rotation.
The internal abdominal oblique is a broad, thin muscular sheet found on the lateral side of the abdomen. It is one of three layers of the lateral abdominal wall, along with the external oblique and transversus abdominis. The internal abdominal oblique is important for movements of the trunk, maintaining normal abdominal tension, and increasing intra-abdominal pressure. When contracted bilaterally, it flexes the trunk and compresses the intra-abdominal viscera, increasing intra-abdominal pressure.
Together, the rectus abdominis, external oblique, and internal oblique abdominal muscles contribute to spinal flexion and core stability. Weakness in these muscles can predispose individuals to spinal problems.
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The hamstrings can cause lower back pain
The spine is a complex structure, and its movement is influenced by various muscles, including those in the trunk and pelvis. These muscles work together to create a stable spine position and prevent it from falling when leaning off the vertical.
The hamstrings are muscles located in the back of the thigh that affect the mobility of the pelvis and lumbar spine. Tight hamstrings can restrict the pelvis's movement, potentially altering the lumbar pelvic rhythm and increasing strain on the lumbar spine. This increased strain can contribute to the development or exacerbation of lower back pain (LBP).
Prolonged periods of sitting can diminish hamstring mobility, further increasing the risk of discomfort and injury. Sitting for extended periods can also lead to tight hip flexors and an increased anterior pelvic tilt, placing excess stress on the lumbar spine and affecting the hamstrings' ability to contract and produce force.
Tight hamstrings can manifest as lower back pain, reduced flexibility, difficulty straightening the legs, and discomfort when sitting or standing for extended periods. Treatment for tight hamstrings and associated lower back pain typically involves a well-rounded approach, including chiropractic adjustments, strengthening exercises, and lifestyle modifications such as regular movement breaks and practicing good posture.
While tight hamstrings are connected to lower back pain, it is important to note that other factors, such as spinal derangement, nerve entrapment, and muscular inhibition, can also contribute to LBP. A comprehensive evaluation should consider all potential structures, including muscles, joints, tendons, and nerves, to identify the root cause of the pain.
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Frequently asked questions
The three main types of back muscles that help the spine function are extensors, flexors, and obliques.
Flexors are attached to the front of the spine and enable actions such as bending forward, lifting, and arching the lower back.
Extensors are attached to the back of the spine and enable actions such as standing and lifting objects.
Obliques are attached to the sides of the spine and help rotate the spine and maintain proper posture.
Some examples of flexor muscles include the rectus abdominis, external oblique abdominal muscles, internal oblique abdominal muscles, psoas major, and psoas minor.
