Rotator Cuff Muscles (SITS)

Question 1

Supraspinatus Muscle:

Answer 1

Origin:
- Supraspinous fossa

Insertion:
Greater tubercle of humerus

Function:
- Abduction of the arm
- Stabilizes shoulder joint

Question 2

Infraspinatus Muscle:

Answer 2

Origin:
- Infraspinatus fossa

Insertion:
- Greater tubercle of humerus

Function:
- Lateral rotation of arm
- Stabilizes shoulder joint

Question 3

Teres Minor:

Answer 3

Origin:
- Lateral border of scapula

Insertion:
Greater tubercle of humerus

Function:
- Lateral rotation of humerus
- Stabilizes shoulder joint

Question 4

Subscapularis Muscle:

Answer 4

Origin:
- Subscapular fossa

Insertion:
- Lesser tubercle of humerus

Function:
- Medial rotation of the arm
- Stabilizes shoulder joint