We'll discuss the function and anatomy. The shoulder muscles play a large role in how we perform tasks and activities in daily life. ... It’s the second most frequently injured shoulder muscle.

Tendinosis, a wear-and-tear condition that weakens the tendon; Shoulder problems, such as tendonitis, bursitis, impingement, or a rotator cuff tear; Smoking, which reduces blood flow and slows healing ...

The ball-and-socket structure of your shoulder and arm is an intricate arrangement of muscles, tendons, and bone. Injuries to the rotator cuff are common, but treatment is often successful. How we ...

Tendons: The rotator cuff and bicipital tendons help lift the arm and rotate the shoulder. They are a common site of shoulder injuries. Ligaments: These thick bands of tissue help connect bones.

Each shoulder has three separate muscles that, together, compose the deltoid muscle parts: Anterior deltoids. When you move your thumb inward, you use your anterior deltoids.