Rotator cuff muscles

Question 1

Locate and give the origin, insertion, and action of the supraspinatus

Answer 1

o Origin: supraspinous fossa
o Insertion: greater tuberosity
o Action: abducts the arm

Question 2

Locate and give the origin, insertion, and action of the infraspinatus

Answer 2

o Origin: infraspinous fossa
o Insertion: greater tuberosity
o Action: laterally rotates the arm

Question 3

Locate and give the origin, insertion, and action of the subscapularis

Answer 3

o Origin: subscapular fossa
o Insertion: lesser tuberosity
o Action: medially rotates the arm

Question 4

Locate and give the origin, insertion, and action of the teres minor

Answer 4

o Origin: lateral border of scapula
o Insertion: greater tuberosity
o Action: laterally rotates the arm