The Erector Spinae is the PRIME MOVER of BACK EXTENSION.
Firstly, I should note that there are 3 sets muscles (one on each side of the back, close to the vertebral column) that make up the Erector Spinae: Iliocostalis, Longissimus, Spinalis.
The actions: Extends head, and turns it to each side. Extends vertebral column, maintains erect posture, bends vertebral column to laterally.
Hope this helps, if anyone wants extra information let me know. I know the image isn't quite the same as in our textbooks, BUT it gives you a general idea of where the Erector Spinae is located
Happy studying
Ciao Aimz
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