Rotator cuff muscles (SItS, the t is small because teres is minor)

• Supraspinatus - suprascapular nerve - abduction (the initiator of arm abduction from 0-15º), assessed by an "empty/full can" test
• Infrapsinatus - suprascapular nerve - external rotation, pitching injury
• teres minor - axillary nerve - adduction and external rotation
• Subscapularis - upper/lower subscapular nerves - internal rotation and adduction (injuries to this muscle are difficult to detect because the pectoralis major compensates for the loss)