Rotator Cuff Muscles

Question 1

Subscapularis Function

Answer 1

• Internal Rotation

- Prevents anterior dislocation of the humerus

Question 2

Infraspinatus Function

Answer 2

• External Rotation

- Prevents displacement of the humerus

Question 3

Teres Minor Function

Answer 3

• External Rotation

- Prevents displacement of the humerus

Question 4

Supraspinatus Function

Answer 4

• Abduction

- Prevents displacement of the humerus

Question 5

Subscapularis Origin and Insertion

Answer 5

• O: Subscapular fossa

- I: Lesser tubercle of the humerus

Question 6

Infraspinatus Origin and Insertion

Answer 6

• O: Infraspinus Fossa

- I: Greater tubercle of the humerus

Question 7

Teres Minor Origin and Insertion

Answer 7

• O: Lateral border of the scapula

- I: Greater tubercle of the humerus

Question 8

Supraspinatus Origin and Insertion

Answer 8

• O: Supraspinous fossa

- I: Greater tubercle of the humerus

Question 9

Rotator Cuff Muscles

Answer 9

Supraspinatus
Infraspinatus
Teres Minor
Subscapularis

Question 10

Supraspinatus Innervation

Answer 10

Suprascapular C4, 5, 6

Question 11

Subscapularis Innervation

Answer 11

Upper and lower subscapular C5, 6, 7

Question 12

Teres Minor Innervation

Answer 12

Axillary C5, 6

Question 13

Infraspinatus Innervation

Answer 13

Suprascapular C4, 5, 6