They also protect the main shoulder joint, the glenohumeral. About eight shoulder muscles attach to the shoulder blade (scapula), upper arm (humerus), and collar bone (clavicle).

It serves as part of the shoulder joint and as an anchor for many of the arm, upper back, and shoulder muscles. Scapula function depends on these muscles, which include the: Levator scapulae .

Objectives: To identify whether subjects with glenohumeral translational instability present with a strength deficit in their internal rotator musculature, and therefore to determine if general ...