Which of the following muscles is NOT directly involved with scapular movement?

The pectoralis major is primarily responsible for movements of the shoulder joint rather than direct involvement with scapular movement. Its main actions include flexion, adduction, and internal rotation of the humerus. Although it has a minor contribution to the stabilization of the scapula as it attaches to the anterior surface of the chest and rib cage, it does not play a significant role in the movement or positioning of the scapula itself.

In contrast, the other muscles listed—levator scapulae, serratus anterior, pectoralis minor, and rhomboids—are all directly involved in scapular motion. The levator scapulae primarily assists in elevating the scapula, while the serratus anterior is crucial for protraction and upward rotation of the scapula. The pectoralis minor is also involved in scapular stabilization and downward rotation, and the rhomboids play a significant role in retracting the scapula. Therefore, these muscles have more direct effects on the movements and positioning of the scapula in various activities.