Rotator Cuff muscles of the shoulder

SITS muscles

Supraspinatus, Infraspinatus, Teres Minor, Subscapularis are muscles that sit in the shoulder girdle of the scapula (rotator cuff muscles). 

Rotator cuff as a group - depresses humerus(arm bone in lay man's terms) and cancels superior translation by deltoid(stops deltoid being too strong).
page 158 muscle manual Dr. Nikita A. Vizniak 2008

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