The location of the rotator cuff muscles in relation to the glenohumeral joint minimizes the upward pressure against the acromion of the scapula.
The glenohumeral joint, which consists of a complex, dynamic articulation between the proximal humerus and the glenoid of the scapula, is a ball-and-socket joint. Particularly, the glenoid cavity (or fossa) of the scapula is in touch with the head of the humerus.
The upper limb exists connected to the axial skeleton by the synovial joint comprehended as the glenohumeral, or shoulder, joint. Between the glenoid fossa of the scapula (gleno-) and the head of the humerus, it exists a ball-and-socket joint (-humeral).
The rotator cuff muscles' position in regard to the glenohumeral joint reduces the pressure exerted upward on the scapula's acromion.
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