The infraspinatus and teres minor are responsible for external rotation. Both the infraspinatus and supraspinatus muscles are innervated by a suprascapular nerve.
cbrelandRotator cuff muscles: Supraspinatus, infraspinatus, teres minor, subscapularis (SITS), their movement is AEEI --> Abduction (first 15), external rotation, external rotation, and internal rotation, respectively. Someone threw out SITS AEEI on another nbmeanswers thread so I'm using it here. Hope this helps+3
submitted by โbwdc(697)
The infraspinatus and teres minor are responsible for external rotation. Both the infraspinatus and supraspinatus muscles are innervated by a suprascapular nerve.