Dominic Stone
The erector spinae is a group of muscles that are part of the intrinsic back muscles and form the intermediate layer. They extend on either side of the vertebral column, between the base of the cranium and the pelvis. The erector spinae muscles are the most superficial of the posterior trunk muscles and play an important role in spinal stability. They are divided into three groups: the iliocostalis, the longissimus, and the spinalis. These muscles control the forward flexion of the thorax and help maintain posture by steadying the spine on the pelvis during walking.
| Characteristics | Values |
|---|---|
| Type | Core and paraspinal muscles |
| Location | Vertebral column and ribs |
| Structure | Three groups: iliocostalis, longissimus, and spinalis |
| Function | Extend and laterally flex the spine, stabilize the lumbar spine |
| Blood Supply | Vertebral, deep cervical, occipital, intercostal, and lumbar arteries |
| Innervation | Lateral branches of the posterior rami of cervical, thoracic, and lumbar spinal nerves |
| Pathology | Low back pain (LBP) due to muscle spasms and increased activity |
| Exercises | Lumbar stabilization exercises, core stabilization exercises |
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What You'll Learn
The erector spinae is a group of epaxial muscles
The iliocostalis muscles are the most lateral part of the erector spinae and are responsible for extending and laterally flexing the spine. They attach to the ribs and can affect the position of the hip and rib cage. The longissimus muscles form the middle part of the erector spinae and are the thickest and longest muscles in the group. They attach along the transverse process of the vertebrae and help extend and laterally flex the spine, as well as rotate the head.
The spinalis muscles are the most medial erector spinae muscles and are innervated by the lateral branches of the posterior rami of the cervical, thoracic, and lumbar spinal nerves. They function to extend and laterally flex the cervical and thoracic regions of the spine. The erector spinae muscles are the most superficial of the posterior trunk muscles and provide gross control over the vertical stability of the vertebral column.
The erector spinae muscles have a paired and segmental nature, allowing them to control movement at individual intervertebral junctions. They receive a rich source of sensory feedback, which is essential for subconscious control of postural alignment. These muscles also play a role in stabilizing the lumbar spine, especially in individuals with low back pain where there is decreased activity and atrophy of the multifidus muscle.
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It extends the vertebral column
The erector spinae muscles are a group of epaxial muscles on the dorsal surface of the vertebral column and ribs. They extend the vertebral column, with the muscles running on either side of the column, from the base of the cranium to the pelvis. The erector spinae muscles are divided into three groups: the iliocostalis, longissimus, and spinalis. The iliocostalis is the most lateral part of the erector spinae muscles, attaching to the ribs. The longissimus forms the middle part of the erector spinae muscles and is the thickest and longest muscle group. It attaches along the transverse process of the vertebrae. The spinalis muscles are the most medial erector spinae muscles and are innervated by the lateral branches of the posterior rami of the cervical, thoracic, and lumbar spinal nerves.
The erector spinae muscles function to extend and laterally flex the spine. Bilateral contraction of these muscles extends the spine, while unilateral contraction causes lateral flexion. They also play a role in spinal stability, particularly in individuals with low back pain. In such cases, there is decreased activity and atrophy of the multifidus muscle, compromising spinal stability. The erector spinae muscles compensate for this by increasing their activity to stabilize the lumbar spine. However, this increased activity can also increase the risk of injury by raising the compressive load on the vertebral column.
The erector spinae muscles are the most superficial of the posterior trunk muscles and provide gross control over the vertical stability of the vertebral column. They receive arterial blood supply from branches of the vertebral, deep cervical, occipital, intercostal, and lumbar arteries. The erector spinae muscles are important for maintaining spinal alignment and posture, helping to steady the spine on the pelvis during walking. Exercises that focus on strengthening these muscles can help maintain the normal curvatures of the vertebral column and improve spinal stability.
The erector spinae muscles can be strengthened through various exercises, including lumbar stabilization exercises and core stabilization exercises. These exercises can help improve spinal stability and posture. However, care should be taken to avoid injury to the lower back when targeting the spinal erectors directly. It is important to perform these exercises correctly and under the guidance of a qualified professional to ensure safety and effectiveness.
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It is divided into three groups
The erector spinae is a bundle of muscles and tendons that run alongside the vertebrae of the spine, from the hip to the base of the skull. As the name suggests, its main function is to erect the spine, keeping it straight and stable, and it plays a crucial role in maintaining posture and facilitating movement. The muscle group is responsible for several movements, including spinal extension, lateral flexion, and medial rotation.
Now, regarding its composition, the erector spinae is indeed divided into three muscle groups, each with distinct attachments and functions:
Iliocostalis: The iliocostalis muscle is the most lateral (external) of the three groups. It originates from the ilium, which is the upper, flared portion of the hip bone, and attaches to the ribs. True to its name, which comes from "ilium" and "rib," the iliocostalis muscle functions to raise the ribs during inhalation and aids in lateral flexion (bending to the side) and spinal extension.
Longissimus: The longissimus muscle is the intermediate layer of the erector spinae. It is the longest and largest of the three groups, running from the skull to the sacrum, and attaches to the ribs and vertebrae. This muscle group is involved in spinal extension and lateral flexion, and also plays a role in respiratory movements by assisting in rib elevation during breathing.
Spinalis: The spinalis muscle is the most medial (internal) of the three groups, lying deep beneath the other two layers. It attaches directly to the spine, spanning from the vertebrae in the neck to the lower back, and is responsible for spinal extension and maintaining spinal stability. The spinalis muscle is divided into three parts: cervical, thoracic, and lumbar, each providing support and movement to the respective regions of the spine.
Each of these three muscle groups within the erector spinae has distinct attachments, functions, and contributions to spinal movement and stability, working together to facilitate various movements and maintain posture.
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It helps to maintain posture
The erector spinae is a large muscle that lies just deep to the thoracolumbar fascia and arises from the erector spinae aponeurosis. It is one of the core and paraspinal muscles, and it helps to maintain posture by stabilising the lumbar spine and steadying the spine on the pelvis during walking.
The erector spinae is made up of three groups of muscles: the iliocostalis, the longissimus, and the spinalis. The iliocostalis is the most lateral part of the erector spinae muscles and attaches to the ribs. The longissimus forms the middle part of the erector spinae muscles and is the thickest and longest muscle in the group. The spinalis muscles are the most medial erector spinae muscles and are innervated by the lateral branches of the posterior rami of the cervical, thoracic, and lumbar spinal nerves.
The erector spinae muscles play an important role in spinal stability, especially in individuals with low back pain. In these individuals, there is decreased activity and atrophy of the multifidus muscle, which compromises spinal stability. The spinal control is then compensated for by increased activity of the erector spinae muscle. This increased activity can increase the compression load on the vertebral column, which may increase the risk of injury.
Lumbar stabilization exercises can help to strengthen the multifidus muscle and restore the function of the erector spinae muscles in individuals with low back pain. These exercises focus on strengthening muscles that maintain the normal curvatures of the vertebral column, promoting a neutral spine that evenly disperses internal and external forces throughout the region's supporting structures. By improving spinal alignment and stability, these exercises can help to improve posture and reduce the risk of injury associated with increased compression loads on the vertebral column.
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It is innervated by the lateral branches of the posterior rami of the spinal nerves
The erector spinae is a large and superficial muscle that lies just deep to the thoracolumbar fascia. It is formed of three muscles with fibres running vertically throughout the lumbar, thoracic and cervical regions. The erector spinae muscles are the most superficial of the posterior trunk muscles, and they play an important role in spinal stability.
The erector spinae can be divided into three groups, from lateral to medial: iliocostalis, longissimus, and spinalis. The iliocostalis is the most lateral part of the erector spinae muscles and attaches to the ribs. The longissimus forms the middle part of the erector spinae muscles and is the thickest and longest muscle group. The spinalis muscles are the most medial and are divided into three regional groups: spinalis capitis, spinalis thoracis, and spinalis cervicis.
The spinalis muscles are innervated by the lateral branches of the posterior rami of the spinal nerves. Specifically, these are the cervical, thoracic, and lumbar spinal nerves. The longissimus muscles have identical innervation to the spinalis muscles. Similarly, the iliocostalis muscles are innervated by the lateral branches of the posterior rami of the cervical, thoracic, and lumbar spinal nerves.
The erector spinae muscles function to extend and laterally flex the spine. They also help to maintain posture by steadying the spine on the pelvis during walking. In individuals with low back pain, the erector spinae muscles may work harder to compensate for decreased activity in other muscles, which can increase the risk of injury.
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Frequently asked questions
The erector spinae muscles are a group of epaxial muscles that lie on the dorsal surface of the vertebral column and ribs. They extend on either side of the vertebral column, between the base of the cranium and the pelvis.
The erector spinae muscles help to extend the vertebral column and control movement at individual intervertebral junctions. They also play a crucial role in maintaining posture and spinal stability.
The erector spinae muscles can be divided into three groups from lateral to medial: iliocostalis, longissimus, and spinalis. Each of these groups has three subdivisions named according to the region of the spine they insert into.
In individuals with low back pain, there is often decreased activity and atrophy of the multifidus muscle, which affects spinal stability. To compensate, the erector spinae muscles increase their activity, which can lead to an increased risk of injury due to the additional compression load on the vertebral column.
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