Rotator Cuff Muscles

Question 1

Rotator cuff muscles action

Answer 1

Stabilises the glenohumeral joint

Question 2

Supraspinatus

Answer 2

-Action: Abduction of arm (0-15 degrees)
-origin: supraspinous fossa of scapula
-insertion: greater tubercle of humerus

Question 3

Infraspinatus

Answer 3

-Action: external rotation
-Origin: infraspinous fossa of scapula
-insertion: greater tubercle of humerus

Question 4

Teres minor

Answer 4

-Action: external rotation
-Origin: lateral border of scapula
-insertion: greater tubercle of humerus

Question 5

Subscapularis

Answer 5

-Action: internal rotation
-origin: subscapular fossa of scapula
-insertion: lesser tubercle of humerus