What actions are attributed to the subscapularis muscle?

The subscapularis muscle is a key muscle in the shoulder that primarily functions to medially rotate the humerus. This action plays a crucial role in various movements of the upper limb, particularly in activities that involve bringing the arm closer to the body or rotating it inward.

In addition to its medial rotation function, the subscapularis also contributes to the adduction of the humerus. Adduction refers to the movement of the arm towards the midline of the body. When the subscapularis contracts, it pulls the humerus closer to the torso, facilitating this adduction.

Understanding the role of the subscapularis is essential in the context of shoulder mechanics, as proper functioning of this muscle can significantly impact activities involving lifting, throwing, or pushing. The combination of medial rotation and adduction provided by the subscapularis is central to maintaining shoulder stability and function, particularly in overhead movements.

The other actions attributed to the remaining options do not align with the primary functions of the subscapularis muscle. For example, abduction and lateral rotation are typically associated with other shoulder muscles, such as the supraspinatus and infraspinatus. Recognizing these distinctions helps clarify the specific