The document describes the four rotator cuff muscles - supraspinatus, infraspinatus, teres minor, and subscapularis. It details the origin, insertion, and innervation of each muscle. It then explains the main functions of the rotator cuff muscles are to stabilize the humerus in the shoulder joint, abduct the shoulder joint with supraspinatus, externally rotate the shoulder with infraspinatus and teres minor, and depress the humerus with subscapularis.

1. D R N A V E E D K H A L I D
Rotator Cuff Muscles

2. SItS

6. Supraspinatus:
 originates above the spine of the shoulder blade from
supraspinatus fossa
 inserts on the greater tuberosity of the humerus.
 Innervation : Suprascapular nerve

8. Infraspinatus
 originates below the spine of the scapula, in the
infraspinatus fossa,
 inserts on the posterior aspect of the greater
tuberosity of the humerus.
 Innervation : Suprascapular nerve

10. Teres minor
 originates on the lateral border of scapula
 inserts on the greater tuberosity of the humerus.
 Innervation : Axillary nerve

12. Subscapularis
 originates on the anterior surface of the scapula from
subscapularis fossa
 inserts on the lesser tuberosity of the humerus
 Innervation :
 Upper and lower subscapular nerves

14. Function
 Each rotator cuff muscle performs a specific and
important function for your shoulder joint

15. Stabilizing the head of the humerus in the
shoulder joint
 The supraspinatus, infraspinatus, teres minor, and
subscapularis muscles all work together to achieve
this

16. Abducting or elevating the shoulder
joint out to the side
 These motions are performed by the supraspinatus.

17. Externally rotating the shoulder joint
 The infraspinatus and teres minor muscles are
responsible for this movement

18. Depressing the head of the humerus
 The subscapularis muscle performs this additional
function to allow the humerus to move freely in the
shoulder joint during the elevation of the arm

20. Thank You !