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The erector spinae () or back erectors is a set of muscles that correct the alignment of and turn the back. This Piece Covers It Well [modify] The erector spinae is not just one muscle, but a group of muscles and tendons which run more or less the length of the spinal column left wing and the right, from the sacrum, or sacral region, and hips to the base of the skull.

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These muscles rest on either side of the spinous procedures of the vertebrae and extend throughout the lumbar, thoracic, and cervical regions. The erector spinae is covered in the lumbar and thoracic areas by the thoracolumbar fascia, and in the cervical region by the nuchal ligament. This large muscular and tendinous mass varies in size and structure at various parts of the vertebral column.

In the lumbar area, it is bigger, and forms a thick fleshy mass. Further up, it is partitioned into 3 columns. They slowly lessen in size as they rise to be inserted into the vertebrae and ribs. The erector spinae is attached to the medial crest of the sacrum (a somewhat raised function of the sacrum more detailed towards the midline of the body as opposed to the "lateral" crest which is even more away from the midline of the body), to the spinous processes of the lumbar, and the eleventh and twelfth thoracic vertebrae and the supraspinous ligament, to the back part of the inner lip of the iliac crests (the top border of the hips), and to the lateral crests of the sacrum, where it blends with the sacrotuberous and posterior sacroiliac ligaments.

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The muscular fibers form a big fleshy mass that splits, in the upper lumbar region, into three columns, viz., a lateral (iliocostalis), an intermediate (longissimus), and a median (spinalis). Each of these consists of three parts, inferior to remarkable, as follows: Iliocostalis [modify] The iliocostalis stems from the sacrum, erector spinae aponeurosis, and iliac crest.

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It has 3 parts with different origin and insertion: longissimus thoracis stems from the sacrum, spinous processes of the lumbar vertebrae, and transverse process of the last thoracic vertebra and inserts in the transverse procedures of the lumbar vertebrae, erector spinae aponeurosis, ribs, and costal processes of the thoracic vertebrae.