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The erector spinae (/ ɪ ˈ r ɛ k t ər ˈ s p aɪ n i / irr-EK-tər SPY-nee) [1] or spinal erectors is a set of muscles that straighten and rotate the back. The spinal erectors work together with the glutes ( gluteus maximus , gluteus medius and gluteus minimus ) to maintain stable posture standing or sitting .
The piriformis nerve, also known as the nerve to piriformis, is the peripheral nerve that provides motor innervation to the piriformis muscle. Structure [ edit ]
The piriformis muscle (from Latin piriformis 'pear-shaped') is a flat, pyramidally-shaped muscle in the gluteal region of the lower limbs. It is one of the six muscles in the lateral rotator group . The piriformis muscle has its origin upon the front surface of the sacrum , and inserts onto the greater trochanter of the femur .
Spinalis dorsi, the medial continuation of the sacrospinalis, is scarcely separable as a distinct muscle.It is situated at the medial side of the longissimus dorsi, and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae: these, uniting, form a small muscle which is inserted by separate tendons ...
After they branch off the dorsal rami, they pass through the erector spinae muscle, psoas major, paraspinal muscles, and then inferior latissimus dorsi to reach the iliac crest. [5] The nerves then pass through an osteofibrous tunnel created by the thoracolumbar fascia and rim of the superior iliac crest. [6]
Muscles Worked: Erector spinae muscles (which help with spine stabilization), rectus abdominis and glutes. Common Mistakes: Arching the spine, rotating the hips, shifting your body weight from ...
[2] [3] It can also be used for applying a nerve block known as the rhomboid intercostal block, which can be used to relieve pain after rib fractures, and a thoracotomy. This nerve block is usually achieved by injection of the local anesthetic agent into the fascial plane between the rhomboid upper intercostal muscle and the rhombic muscles.
The posterior layer is thick, being reinforced by the aponeurosis (origin) of the latissimus dorsi muscle. [1]: 274 It consists of a superficial lamina derived primarily from the latissimus dorsi and serratus posterior inferior, and a deeper lamina which forms a retinacular sheet encapsulating the paraspinal muscles. [3]