The Rotator Cuff

Question 1

Subscapularis

Answer 1

Origin: anterior face of scapula
Insertion: lesser tubercle of humerus
Action: medially rotates arm, prevents anterior dislocation of shoulder

Question 2

Supraspinatus

Answer 2

Origin: posterior scapula superior to spine
Insertion: greater tubercle of humerus
Action: prevents downward dislocation of shoulder

Question 3

Infraspinatus

Answer 3

Origin: posterior scapula inferior to spine
Insertion: greater tubercle of humerus
Action: prevents posterior dislocation

Question 4

Teres Minor

Answer 4

Origin: lateral/posterior scapula
Insertion: greater tubercle of humerus
Action: prevents posterior dislocation

Question 5

Teres Major

Answer 5

Origin: posterior scapula at inferior angle
Insertion: lesser tubercle of humerus
Action: extends, medially rotates, and adducts humerus