The rotator cuff is a group of four muscles that play a crucial role in stabilizing and facilitating movement within the shoulder joint. These muscles work together to provide strength and control during shoulder movements. The four rotator cuff muscles are:
1. Supraspinatus: This muscle is located on the upper part of the shoulder blade and runs beneath the acromion (a bony prominence on the shoulder). It helps to initiate abduction (raising the arm away from the body) of the shoulder and assists in overhead movements.
2. Infraspinatus: Situated on the backside of the shoulder blade, below the spine, the infraspinatus muscle is responsible for external rotation of the shoulder. It aids in turning the arm outward and stabilizes the shoulder joint during various arm movements.
3. Teres Minor: Positioned just below the infraspinatus muscle, the teres minor also assists in external rotation of the shoulder. It works in conjunction with the other rotator cuff muscles to provide stability and control during shoulder movements.
4. Subscapularis: This muscle is located on the front side of the shoulder blade, specifically on its underside. The subscapularis muscle is responsible for internal rotation of the shoulder and also aids in shoulder adduction (bringing the arm closer to the body). It plays a significant role in maintaining the stability of the shoulder joint.
These four muscles work together to provide dynamic stability to the shoulder joint, allowing for a wide range of arm movements while ensuring proper alignment and function.
