Describe the rotator cuff muscles, including their origins, insertions, and actions.

Here is a description of the rotator cuff muscles: The rotator cuff is a group of four muscles that surround the shoulder joint, providing stability and enabling a wide range of motion. They originate from the scapula and insert onto the humerus. Supraspinatus: Origin:* Supraspinous fossa of the scapula. Insertion:* Greater tubercle of the humerus. Action:* Initiates abduction of the arm (first 15 degrees). Infraspinatus: Origin:* Infraspinous fossa of the scapula. Insertion:* Greater tubercle of the humerus. Action:* Laterally rotates the arm. Teres Minor: Origin:* Lateral border of the scapula. Insertion:* Greater tubercle of the humerus. Action:* Laterally rotates the arm. Subscapularis: Origin:* Subscapular fossa of the scapula. Insertion:* Lesser tubercle of the humerus. Action:* Medially rotates the arm. Collectively, these muscles work to stabilize the head of the humerus within the glenoid cavity of the scapula, forming a "cuff" around the shoulder joint. They are crucial for overhead movements and preventing dislocation.