Supraspinatus and Infraspinatus

Supraspinatus

Origin: Supraspinous Fossa

Insertion: Uppermost facet of the greater tubercle of humerus

Action: Abduction of arm

 

Infraspinatus

Origin: Infraspinous Fossa

Insertion: Middle facet of greater tubercle of humerus

Action: External rotation of the humerus

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