College of Massage Therapists of British Columbia (CMTBC) Practice Exam

In a functional movement assessment, which muscle is primarily responsible for stabilizing the scapula during arm elevation?

1. Deltoid

2. Rhomboids

3. Serratus anterior

4. Trapezius

The correct answer is: Serratus anterior

The serratus anterior plays a crucial role in stabilizing the scapula during arm elevation. This muscle is located on the side of the ribcage and attaches to the scapula, helping to secure it against the thoracic wall. When the arm is raised, the serratus anterior facilitates upward rotation of the scapula, which is essential for optimal shoulder function and movement. This stabilization allows for a smooth and efficient arm elevation, minimizing the risk of shoulder impingement or other injuries. While other muscles like the trapezius and rhomboids also contribute to scapular stability and movement, the serratus anterior is uniquely effective in ensuring that the scapula remains stable during the dynamic movements of the arm, particularly when the arm is raised overhead. The deltoid, on the other hand, is primarily an arm mover and does not focus on scapular stabilization during elevation.