Rotator CuffThe musculotendinous cuff is also known as the rotator cuff. It is a group of muscles under the deltoid muscle.
It consists of supraspinatus, infraspinatus, teres minor, and subscapularis. They are more commonly known as the SITS group using the first initial from each muscle in the order above. Below is the muscle study aid for massage therapy students.
SupraspinatusSupraspinatus is the only member of the SITS group that does not rotate the humerus. When carrying something heavy, the supraspinatous stops the arm from downward dislocation.Origin is supraspinatus fossa of the scapula. Insertion is greater tubercle of the humerus. Action--it abducts the shoulder.
InfraspinatusOrigin is infraspinatus fossa of the scapula.Insertion is greater tubercle of the humerus. Action--laterally rotates the shoulder.
Teres MinorOrigin is superior half of lateral border of scapula.Insertion is greater tubercle of humerus. Actions--adducts shoulder and laterally rotates shoulder. Teres Minor is aids Infraspinatus in its movements and may fuse with it.
SubscapularisOrigin is subscapular fossa of scapula.Insertion is lesser tubercle of humerus. Action--medially rotates shoulder. This is also known as the frozen shoulder muscle.
Return from Rotator Cuff to Muscles
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