Rotator Cuff Muscles

Question 1

Infraspinatus

Answer 1

Origin: Infraspinous fossa
Insertion: Greater tuberosity humerus
Action: ER GH, horizontally abd GH
Innervation: Suprascapular nerve

Question 2

Teres minor

Answer 2

Origin: Lateral border of scapula
Insertion: Greater tuberosity humerus
Action: ER GH, Horiz abd GH, (add. GH)
Innervation: Axillary nerve

Question 3

Subscapularis

Answer 3

Origin: Subscapular fossa scapula
Insertion: lesser tuberosity humerus
Action: IR GH, horiz add GH
Innervation: Upper and lower subscapular nerves

Question 4

Supraspinatus

Answer 4

Origin: supraspinous fossa
Insertion: greater tuberosity humerus
Action: Abd GH, (ER GH)
Innervation: suprascapular nerve