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  1. <br> <br><h1 style="clear:both" id="content-section-0">Dynamic Lumbar Spine Stabilization Surgery - UPMC - The Facts<br></h1><br><br> <br><br><br><br> <br><p class="p__0">(See the image listed below.) Back back muscles. Extensors The extensor muscles are set up in 3 layers. The largest group of intrinsic back muscles and main extensor is the erector spinae (or sacrospinalis). In the lower L-spine, the erector spinae appears as a single muscle. At the upper lumbar area, it divides into 3 vertical columns of muscles (iliocostalis, longissimus, spinalis).</p><br><br> <br><br><br><br> <br><br><br> <br><br><br><br> <br><p class="p__1">The iliocostalis is the most lateral, and the spinalis (tiniest muscle) is the most medial. https://justicehood04.livejournal.com/profile (biggest muscle) inserts on to the skull base, whereas the iliocostalis inserts onto the angles of the ribs and transverse processes of the lower cervical vertebrae. As these muscles rose up the vertebral column, they divide regionally depending upon where the muscle attaches par excellence.</p><br><br> <br><br><br><br> <br><p class="p__2">In the sacrum, it originates from the laminar location simply medial to the posterior sacral foramina, from the tendinous origins on the erector spinae, and the medial surface area of the posterior remarkable iliac spine (PSIS). Each fascicle is directed superomedially towards the inferior and median margin of the lamina and nearby spinous process.</p><br><br> <br><br><br><br> <br><div itemscope itemtype="http://schema.org/ImageObject"> <br>  <br>  <br> <span style="display:none" itemprop="caption">Thoracic &amp; Lumbar Spine Fracture – Fracture NI</span> <br>  <br>  <br></div><br><br> <br><br><br><br> <br><br><br><br> <br><div itemscope itemtype="http://schema.org/ImageObject"> <br>  <br>  <br> <span style="display:none" itemprop="caption">Lumbar Spine Anatomy</span> <br>  <br>  <br></div><br><br> <br><br><br><br> <br><br><br><br> <br><h1 style="clear:both" id="content-section-1">Our Lumbar Spine Anatomy - Medscape Reference Diaries<br></h1><br><br> <br><br><br><br> <br><p class="p__3">The transversospinal muscle group acts both as an L-spine extensor and a rotator. A plethora of small, segmental muscles are the deepest layer of the back extensors. They can be divided into 2 groups, both innervated by the dorsal rami of back nerves. The levatores costarum are not usually present in the back spine.</p><br><br> <br><br><br><br> <br><p class="p__4">The interspinales consists of brief fasciculi attached between the spinous processes of adjoining vertebrae. The intertransversarii include 2-3 slips of muscles, which pass between nearby transverse procedures. They are postural stabilizers and increase the effectiveness of bigger muscle group action. Forward flexors Flexors of the L-spine are divided into an iliothoracic (extrinsic) group and a femorospinal (intrinsic) group.</p><br><br> <br><br><br><br> <br><p class="p__5">The femorospinal group is made up of the psoas significant and iliacus muscles. The psoas significant originates from multiple locations: the anterior surface and lower border of transverse procedures of L1-L5, from the bodies and discs of T12-L5. It inserts on to the lesser trochanter of the thigh and is innervated by direct fibers of the back plexus (L1-L3).</p><br><br> <br><br><br><br>
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