The shoulder is made up of several layers, including the following:
Bones. The collarbone (clavicle), the shoulder blade (scapula), and the upper arm bone (humerus).
Joints. The place where movement occurs, including the following:
Sternoclavicular joint (where the clavicle meets the sternum)
Acromioclavicular (AC) joint (where the clavicle meets the acromion)
Shoulder joint (glenohumeral joint). A ball-and-socket joint that facilitates forward, circular, and backward movement of the shoulder.
Ligaments. A white, shiny, flexible band of fibrous tissue that holds joints together and connects various bones, including the following:
Joint capsule. A group of ligaments that connect the humerus to the socket of the shoulder joint on the scapula to stabilize the shoulder and keep it from dislocating.
Ligaments that attach the clavicle to the acromion
Ligaments that connect the clavicle to the scapula by attaching to the coracoid process
Acromion. The roof (highest point) of the shoulder that is formed by a part of the scapula.
Tendons. The tough cords of tissue that connect muscles to bones. The rotator cuff tendons are a group of tendons that connect the deepest layer of muscles to the humerus.
Muscles. Help support and rotate the shoulder in many directions. Facilitate movement of the shoulder.
Rotator cuff. Name of a group of muscles and tendons that rotate the shoulder.
Bursa. A closed space between 2 moving surfaces that has a small amount of lubricating fluid inside; located between the rotator cuff muscle layer and the outer layer of large, bulky muscles.
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