ACTION: internally rotates the humerus
REFERRAL: posterior shoulder and wrist

COMMENTS: this "rotator cuff" muscle attaches to the anterior part of the scapula. It lies between the scapula and the rib cage. Distally it attaches to the anterior part of the humerus, just next to the pectoralis major attachment. This attachment is normally a little tender. You can evaluate if this muscle is strained by internally rotating the arm against resistance. Note that this muscle refers pain to the back of the shoulder. When evaluating the rotator cuff, include this muscle.

ROTATOR CUFF MUSCLES: (acronym SITS) Subscapularis, Infraspinatus, Teres minor, Supraspinatus