Shoulder and Arm

The shoulder comprises three bones (the clavicle, scapula, and humerus) and three joints (the glenohumeral, the acromioclavicular [AC], and the scapu- lothoracic) (Fig. 1).

Figure 1
The bones of the shoulder: the clavicle, humerus, and scapula. The clavicle articulates with the scapula at the acromioclavicular joint. The humerus articulates with the scapula at the glenohumeral joint.

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