CanFitPro Personal Training Specialist Practice Test

What is the function of the superficial erector spinae?

1. Compresses the lumbar spine onto the sacrum

2. Produces and controls lumbar movement

3. Surrounds muscle fibers

4. Encloses the contents of a muscle fiber

The correct answer is: Produces and controls lumbar movement

The superficial erector spinae muscle's main function is to produce and control movement of the lumbar spine. Option A is incorrect because it refers to the action of the posterior and inferior fibers of the erector spinae muscle, which compress the lumbar spine onto the sacrum. Option C is not accurate because the superficial erector spinae does not surround muscle fibers, rather it is a group of muscles that run along the spinal column. Option D is incorrect because it refers to the endomysium, which is a layer of connective tissue that surrounds individual muscle fibers, not the function of the superficial erector spinae muscle. Therefore, the correct answer is B Produces and controls lumbar movement.