What muscle is involved in stabilizing the shoulder joint and also aids in internal rotation?

The subscapularis is a key muscle in the shoulder region that plays a crucial role in stabilizing the shoulder joint. It is located on the anterior (front) surface of the scapula and is one of the four rotator cuff muscles. Its primary function includes internal rotation of the humerus, which is essential for various arm movements and maintaining shoulder stability during those movements.

Stabilization of the shoulder joint is vital, as the shoulder is inherently a mobile joint, allowing for a wide range of motion but also making it vulnerable to injuries. The subscapularis helps to secure the head of the humerus within the shallow socket of the glenoid, preventing dislocation and ensuring smooth movement during activities involving the arms.

This muscle’s role in both stabilization and internal rotation makes it integral to a person's functional strength and performance during exercises that require shoulder movement. Consequently, it is crucial for activities that involve pushing and lifting motions, which commonly engage the shoulder joint.