Why do you think that the muscles of the erector spinae and transversospinal muscle groups remain in a state of continual contraction when we are upright?

Video transcript

Hi, everyone. Let's take a look at this practice problem together. The rector spina muscles are positioned in the intermediate layer of the back muscles and have attachments to all of the following structures. Except the answer options include a skull, B, ilium, C clavicle and D the sternum. So recall that the rector spinal muscles are three different muscle groups that are found on the posterior back and they run vertically along both sides of the spine. Now, if we take a glance at the answer options, notice that clavicle is the only bone that is located on the anterior side of the body. Since the Rector spinning muscles are located on the posterior side along the back, it's a back muscle. They have muscle attachments to the skull, the ilium and the sacrum. So the exception is the clavicle, the correct answer therefore is option C clavicle. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.