action of subscapularis
Medially rotate humerus
The subscapularis muscle is a broad, triangular muscle that lies in the anterior (front) aspect of the shoulder joint. It is one of the four rotator cuff muscles and plays a key role in the movement and stability of the shoulder joint. The action of subscapularis includes the following:
1. Internal rotation of the arm: When the subscapularis muscle contracts, it pulls the humerus bone towards the center of the body, causing internal rotation of the arm.
2. Adduction of the arm: The subscapularis muscle also helps to adduct the arm by drawing it closer to the body.
3. Stabilization of the shoulder joint: The subscapularis muscle is one of the main stabilizers of the shoulder joint. It helps to hold the head of the humerus bone in place in the shoulder socket, preventing it from dislocating or subluxating.
4. Flexion of the arm: The subscapularis muscle also assists in flexing the arm (bringing the arm forward) by moving the humerus bone forward and medially.
Overall, the subscapularis muscle is an essential component of the rotator cuff and is crucial for the proper functioning and stability of the shoulder joint.
More Answers:
Understanding the Infraspinatus Muscle: Function, Importance, and Tips for StrengtheningA Step-by-Step Guide to Safe and Effective Infraspinatus Muscle Insertion Procedure with Proper Technique and Monitoring.
The Importance of Infraspinatus Muscle in Shoulder Stability and Function