What action is associated with the upper trapezius during shoulder movement?

• A. Depression of the scapula
• B. Upward rotation of the scapula
• C. Protraction of the scapula
• D. Downward rotation of the scapula

Answer: (B)

The upper fibers of the trapezius primarily help elevate the scapula and assist with rotating the scapula upward when the arm is raised. This upward rotation is essential for full overhead movement and occurs as the upper trapezius works with the lower trapezius and serratus anterior. Among the options, upward rotation of the scapula best reflects the action the upper trapezius contributes to during shoulder movement. Depression of the scapula is mainly a lower trapezius role, protraction is driven by serratus anterior (and pec minor), and downward rotation is produced by other muscles like the rhomboids and pectoralis minor.