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Anatomy of the Shoulder

 




The two main bones of the shoulder are the humerus and the scapula (shoulder blade).

The joint cavity is cushioned by articular cartilage covering the head of the humerus and face of the glenoid. The scapula extends up and around the shoulder joint at the rear to form a roof called the acromion, and around the shoulder joint at the front to form the coracoid process.

The end of the scapula, called the glenoid, meets the head of the humerus to form a glenohumeral cavity that acts as a flexible ball-and-socket joint.

The joint is stabilized by a ring of fibrous cartilage surrounding the glenoid called the labrum.

Ligaments connect the bones of the shoulder, and tendons join the bones to surrounding muscles. The biceps tendon attaches the biceps muscle to the shoulder and helps to stabilize the joint.

Four short muscles originate on the scapula and pass around the shoulder where their tendons fuse together to form the rotator cuff. (Get the FAQs on rotator cuff tears).

All of these components of your shoulder, along with the muscles of your upper body, work together to manage the stress your shoulder receives as you extend, flex, lift and throw.

Orthopedic Articles: Shoulder Topics

Rotator Cuff Tears
Shoulder Instability
Calcium Deposits
AC Joint
Biceps Tendon
Shoulder Arthritis

 
 
 
 
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