Moving up the arm with our Mnemonic Notes series we're going to look at the rotator cuff muscle group: SITS (Supraspinatus, Infraspinatus, Teres Minor, Subscapularis) #CompleteAnatomy #3D4Medical #Elsevier #CompleteAnatomyMnemonicNotes #MnemonicNotes #MedicalMnemonics #MedicalStudent #MedEd #MedicalEducation #MedicalStudy | Complete Anatomy

Why does the rotator cuff get injured? . To raise your arm, the deltoid muscle needs to engage. It's well-suited for this task, but as it works, it rolls the head of the humerus upward. . In a healthy shoulder, this upward roll is balanced by muscles that insert near the head of the humerus from below, such as the subscapularis and teres minor. . However, if these muscles don't engage properly, the humerus head will roll upward, reducing the space available for the supraspinatus tendon to slide