Internal oblique- a laterally lying muscle that is deep. Arises from the iliac crest and inserts into the inferior ribs and the xiphoid process. It compresses the abdomen, depresses the ribs and flexes the vertebral column.
Which muscles are responsible for flexing the lumbar spine?
These muscles include the large paired muscles in the lower back, called erector spinae, which help hold up the spine, and gluteal muscles. The flexor muscles are attached to the front of the spine and enable flexing, bending forward, lifting, and arching the lower back.
What is flexion of the lumbar spine?
Flexion is the anatomical name for forward bending. When treating back pain, many spine specialists encourage exercises to strengthen the muscles that act to bring the spine into flexion. In the lower back, approximately 50% of flexion occurs at the hips, and 50% occurs at the lower spine.
What is the main flexor of the lumbar spine?
The psoas major originates from multiple areas: the anterior surface and lower border of transverse processes of L1-L5, from the bodies and discs of T12-L5. It inserts on to the lesser trochanter of the femur and is innervated by direct fibers of the lumbar plexus (L1-L3). Its primary action is hip and trunk flexion.
What muscle is responsible for bending the lumbar vertebrae to the side?
The paraspinal muscles, sometimes called the erector spinae, are three muscle groups that support your back. You use them every time you lean to one side, arch your back, bend forward, or twist your torso.
Which muscles are prime movers for lateral flexion of the lumbar spine?
All trunk flexors and extensors can produce lateral flexion when acting unilaterally. The major muscles involved are the rectus abdominis, external and internal obliques, erector spinae, semispinalis thoracis, latissimus dorsi, deep posterior spinal muscles, quadratus lumborum, and psoas.
What ranges of motion are possible at the lumbar spine?
Motion of the lumbar spine occurs in 3 planes and includes 4 directions, as follows:
- Forward flexion: 40-60°
- Extension: 20-35°
- Lateral flexion/side bending (left and right): 15-20°
- Rotation (left and right): 3-18°
What are spinal flexion exercises?
o Lie on your back with your hands at your side and your knees bent. o Use your abdominal muscles to raise your upper back off the floor, while exhaling. o Raise your upper body off the floor with one shoulder slightly higher than the other. o Do not thrust yourself off the floor or lift your head with your arms. o …
What muscle looks like a shark fin and plays a role in movement of the lumbar spine?
Erector Spinae Muscle and Low Back Pain
The erector spinae muscle plays an important role in the spinal stability.
Where is the lumbar muscle?
The lumbar region is situated between the thoracic, or chest, region of the spine, and the sacrum. The lumbar spine typically has a slight inward curve known as lordosis. The lower back region contains large muscles that support the back and allow for movement in the trunk of the body.
Why does the muscle next to my spine hurt?
In most cases, upper and middle back pain is caused by: Overuse, muscle strain, or injury to the muscles, ligaments, and discs that support your spine. Poor posture. Myofascial pain that affects the connective tissue of a muscle or group of muscles.