https://youtu.be/Ilza4mNbkxgSubscapularis Muscle Anatomy and FunctionThe subscapularis is innervated by both the upper and lower subscapular nerves.Primary actions: internal rotation and adduction of the shoulder.Fatty Infiltration as an IndicatorFatty infiltration of the subscapularis muscle is a specific but insensitive marker for subscapularis tendon tears.The variability of this finding rela..