Erector spinae

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the muscles are labeled in red and there is an arrow pointing up to the left

The ESGs or Erector Spinae Group consists of the Spinalis, Longissimus, and Illiocostalis muscles. They work together to move the vertebral column. Unilaterally they have one action and bilaterally they have one action. Unilaterally: laterally flex the vertebral column to the same side. Bilaterally: Extension of the vertebral column.

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an image of the muscles and their corresponding structures, including the exector spinaeus

Latissimus dorsi is a superficial muscle that covers the largest part of the back. It’s form is diverse and influenced by many factors. The picture shows how the erector spinae deep muscles influence the form of Latissimus dorsi. Erector spinae is a group of three muscles with a joint function – it can be thought of as the abs of the back. This muscle group allows to straighten the back and provides for side-to-side rotation. When it’s flexed, it influences the surface forms of Latissimus…

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