The shoulder is made up of bones, muscles, ligaments, and tendons. They work together so you can reach, swing, and lift in comfort. Learning about the parts of the shoulder joint will help you to understand your shoulder problem.
The shoulder joint is where the humerus (upper arm bone) meets the scapula (shoulder blade):
Muscles and ligaments help make up the joint. They attach to the shoulder blade and upper arm bone.
At the top of the shoulder blade are two bony knobs called the acromion and coracoid process.
The subacromial space is between the top of the humerus and the acromion. This space is filled with tendons, muscles, and the subacromial bursa.
The bursa is a sac of fluid that cushions shoulder parts as they move.
The supraspinatus muscle and tendon are located in the subacromial space. They help form the rotator cuff and are commonly injured in a rotator cuff tear.