What motion is the erector spinae responsible for? Rotation of the trunk
Lateral flexion of the trunk
Extension of the trunk
All of the above

I would be the extension of the trunk

Explanation:

The erector spinae muscle extends the vertebreal column. [1] It is formed of 3 muscles and its fibers run more or less vertically throughout the lumbar, thoracic and cervical regions. It lies in the groove to the side of the vertebral column. In cervical region it is covered by nuchal ligament and in thoracic and lumber region by thoracolumbar fascia.

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