The arm

  The arm is the part of the upper limb between the glenohumeral joint (shoulder joint) and the elbow joint. In common usage, the arm extends to the hand. It can be divided into the upper arm, which extends from the shoulder to the elbow, the forearm which extends from the elbow to the hand, and the hand. Anatomically the shoulder girdle with bones and corresponding muscles is by definition a part of the arm. 
The majority of injuries that occur to the arm are in the shoulder joint. Shoulder injuries are commonly tendon or ligament problems. 

Tendinitis: Inflammation of tendon. 

Rotator Cuff: Damage to the muscles that hold the joint in position. 
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