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The muscles of the back are categorised into three groups: the intrinsic or deep muscles, the superficial muscles, and the intermediate muscles. Spinal flexion involves bringing the anterior surfaces of the vertebrae and trunk closer together. The muscles that perform spinal flexion include the rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles. These muscles are known as spinal flexors and are responsible for movements such as the curl-up, curl-back, pelvic tilt, and hip lift. The hip flexors are also involved in spinal flexion, particularly during exercises that bring the thigh closer to the pelvis.
| Characteristics | Values |
|---|---|
| Muscle groups | Intrinsic or deep muscles, superficial muscles, intermediate muscles |
| Superficial muscles | Help with shoulder and neck movements |
| Intermediate muscles | Help with the movement of the thoracic cage |
| Intrinsic muscles | Fuse with the vertebral column |
| Flexor muscles | Rectus abdominis, external oblique abdominal muscles, internal oblique abdominal muscles |
| Extensor muscles | Erector spinae, gluteal muscles |
| Oblique muscles | Attached to the sides of the spine |
| Trapezius muscle | Descending, transverse and ascending |
| Latissimus dorsi | Vertebral, iliac, costal, scapular and humeral parts |
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What You'll Learn
- Spinal flexion requires contraction of muscles in the direction opposite to the lean
- Flexor muscles at the front of the spine include abdominal muscles
- The rectus abdominis, external and internal oblique abdominal muscles are spinal flexors
- Spinal extensors are important to control flexion produced by gravity
- The erector spinae are intermediate muscles that help with flexion of the upper vertebral column
Spinal flexion requires contraction of muscles in the direction opposite to the lean
The back muscles can be categorized into three groups: the intrinsic or deep muscles, the superficial muscles, and the intermediate muscles. The intrinsic muscles are considered the true back muscles as they fuse with the vertebral column. The superficial muscles are located posteriorly on the back and help with shoulder and neck movements. The intermediate muscles help with the movement of the thoracic cage.
Spinal flexion involves bringing the anterior surfaces of the vertebrae and trunk closer together. This requires the contraction of muscles in the direction opposite to the lean. When the vertebral column leans off the vertical, the muscles opposite to the direction in which the spine is leaning must contract to control or prevent the falling of the spine in that direction. These muscles are often used together in a coordinated manner to create a stable desired position of the spine.
The flexor muscles, attached to the front of the spine, include the abdominal muscles. They allow us to flex, bend forward, lift, and arch the lower back. The rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles are spinal flexors that undergo concentric contraction during spinal flexion.
The intermediate muscles are the erector spinae, which include the longissimus, iliocostalis, and spinalis muscles. They play a role in the flexion of the upper vertebral column and head. The erector spinae also control the forward flexion of the thorax.
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Flexor muscles at the front of the spine include abdominal muscles
Spinal flexion involves bringing the anterior surfaces of the vertebrae and trunk closer together. The flexor muscles at the front of the spine include abdominal muscles, which allow us to flex, bend forward, lift, and arch the lower back. When the abdominal muscles are weak, the muscles that allow us to bend at the hip get tighter, increasing the curve at the lower back.
The abdominal muscles that perform spinal flexion include the rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles. These muscles are also known as the spinal flexors. They work in tandem with the spinal extensors to control spinal flexion. For example, in a roll-down movement, the spinal flexors initiate the movement, and the spinal extensors work to control the spinal flexion produced by gravity.
The rectus abdominis is the most superficial abdominal muscle and is responsible for flexing the lumbar spine and tilting the pelvis. The external and internal oblique abdominal muscles are deeper than the rectus abdominis and are responsible for side-bending and rotation movements of the spine. These muscles also help to maintain the curve of the lumbar spine.
In addition to the abdominal muscles, other muscles that contribute to spinal flexion include the erector spinae, which is composed of the longissimus, iliocostalis, and spinalis muscles. These muscles have a common tendinous origin and play a role in the movement of the thoracic cage and flexion of the upper vertebral column and head.
Overall, the flexor muscles at the front of the spine, including the abdominal muscles, work together with other muscle groups to produce spinal flexion and maintain spinal stability.
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The rectus abdominis, external and internal oblique abdominal muscles are spinal flexors
The abdominal muscles are strong bands of muscles lining the walls of the abdomen. They are located towards the front of the body, between the ribs and the pelvis. They have many important functions, including holding organs in place, supporting the body during movement, and protecting the spine. The abdominal muscles, along with the back muscles, make up the core muscles.
The rectus abdominis, external oblique, internal oblique, pyramidalis, and transversus abdominis are the five main abdominal muscles. The rectus abdominis, external oblique, and internal oblique muscles are spinal flexors. The rectus abdominis is the most superficial abdominal muscle and is often referred to as the "'six-pack'". It acts to flex the spinal column, tense the anterior wall of the abdomen, and assist in compressing the contents of the abdomen.
The external oblique muscles are located on each side of the rectus abdominis. They are the largest of the flat muscles and allow the trunk to twist to the opposite side. The internal oblique muscles are located just inside the hip bones and above the external oblique muscles. They operate in the opposite way to the external oblique muscles, with the trunk twisting to the same side as the contracting internal oblique.
The abdominal muscles work in harmony with other core muscles to keep the body stable and balanced. Weak abdominal muscles can lead to a series of problems, including spinal issues. Strengthening the deep trunk muscles through core strength training can help alleviate chronic low back pain.
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Spinal extensors are important to control flexion produced by gravity
The back muscles can be categorized into three groups: the intrinsic or deep muscles, the superficial muscles, and the intermediate muscles. The intrinsic muscles are considered the true back muscles as they fuse with the vertebral column. The superficial muscles are located posteriorly on the back and help with shoulder and neck movements. The intermediate muscles help with the movement of the thoracic cage.
Spinal flexion involves bringing the anterior surfaces of the vertebrae and trunk closer together. The rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles are the primary muscles involved in spinal flexion. These muscles work concentrically to posteriorly tilt the pelvis, flex the spine, and pull the abdominal wall inward.
The erector spinae, semispinalis, and deep posterior spinal muscles are involved in trunk extension. The stretching of the anterior longitudinal ligament and rectus abdominis, relaxation of the posterior ligaments, and contraction of the spinal extensor muscles control this movement.
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The erector spinae are intermediate muscles that help with flexion of the upper vertebral column
The back muscles can be categorised into three groups: the intrinsic or deep muscles, the superficial muscles, and the intermediate muscles. The intrinsic muscles are considered the 'true back muscles' as they fuse with the vertebral column. The superficial muscles, on the other hand, are located posteriorly on the back and help with shoulder and neck movements.
The intermediate muscles, which are also known as the erector spinae, play a role in the movement of the thoracic cage and flexion of the upper vertebral column and head. They include the longissimus, iliocostalis, and spinalis muscles, which all have a common tendinous origin. The erector spinae muscles are subdivided based on their attachments. These muscles are covered by thoracolumbar fascia, and they are relatively small compared to the larger cervical muscle groups, thus having less force capacity.
The erector spinae muscles have several functions, including the extension, lateral flexion, and rotation of the spine, head, and neck. They control the forward flexion of the thorax, which can occur secondary to gravity. The erector spinae muscles are also involved in spinal flexion, which involves the concentric use of the spinal flexors. Spinal flexion occurs when the spine flexes or the pelvis posteriorly tilts against gravity or another external resistance.
Spinal flexion is a complex movement, especially during standing in an erect position. In this position, gravity tends to produce more flexion. After the initiation of movement by the spinal flexors, the spinal extensors become the most important muscles working to control the spinal flexion produced by gravity. Thus, the erector spinae muscles, as intermediate muscles, play a crucial role in spinal flexion, particularly in maintaining stability and controlling the movement.
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Frequently asked questions
The superficial back muscles are responsible for shoulder and neck movements. They are located posteriorly on the back and help with elevating and depressing the ribs.
The intermediate back muscles help with the movement of the thoracic cage and flexion of the upper vertebral column and head. These include the erector spinae muscles, which also help with the extension and lateral flexion of the spine, head, and neck.
The intrinsic or deep back muscles are associated with the movements of the vertebral column and the control of posture. They include the semispinalis, multifidus, and rotatores muscles.
The muscles responsible for spinal flexion are the spinal flexors, which include the rectus abdominis, external oblique abdominal muscles, and internal oblique abdominal muscles.
