Which of the following is a primary action of the levator scapulae?

The primary action of the levator scapulae is to elevate the scapula. This muscle originates from the transverse processes of the upper cervical vertebrae and inserts into the medial border of the scapula. When it contracts, it pulls the scapula upwards, contributing significantly to scapular elevation. This action is essential in various movements such as shrugging the shoulders and lifting the arms overhead.

Understanding the role of the levator scapulae is vital, especially in contexts involving shoulder mechanics and upper back movements, making it clear why elevation is its primary function. This emphasizes its importance in activities that require shoulder girdle stability and function, while the other actions listed do not represent the primary role of this muscle.