Which muscle is primarily responsible for scapula protraction?

The serratus anterior is the muscle primarily responsible for scapula protraction. This muscle originates from the surface of the upper eight or nine ribs and inserts onto the anterior (front) surface of the scapula's medial border. When the serratus anterior contracts, it pulls the scapula forward around the rib cage, which is essential for movements such as pushing, punching, and overhead activities.

Scapula protraction is crucial for various athletic and daily activities, as it allows for optimal shoulder function and movement mechanics. Additionally, the serratus anterior plays a role in stabilizing the scapula, ensuring it remains flush against the thoracic wall during arm movements, which is vital for maintaining shoulder health and preventing injuries.

Other muscles, while involved in scapular movement, do not play the primary role in protraction. For example, the rhomboid major pulls the scapulae toward the spine (retraction), the pectoralis major primarily functions in arm flexion and adduction, and the trapezius has roles in elevating, retracting, and rotating the scapula, but not specifically in its protraction.