The Muscular System

In this week’s episode of “Anatomy of a Mystery”, Dr. Farrell injured his lower back. Which of the following muscles are we least concerned with in this scenario?

    1. Pectoralis major
    2. Rhomboid
    3. Spinalis
    4. Latissimus dorsi

After determining the muscle we are least concerned with, please explain why the others are important in this scenario? What are their functions and what happens when they are injured?