Shoulder Tendons. Tendons are extensions of muscles that attach muscles to bone. Muscles move the bones by pulling on the tendons.
These are located in the shoulder blade area, and each related tendon also attaches to the humerus. The supraspinatus muscle and tendon allow the arm to raise and lower. The infraspinatus muscle and tendon allow the arm to extend forward and sideways. The teres minor and subscapularis muscles and tendons allow the arm to rotate.
There are 10 muscles and 11 shoulder tendons related to shoulder mobility. The shoulder joint offers a fuller range of motion than any other joint in the body. The bicep has two shoulder tendons: the long head and the short head.