Rotator Cuff

Question 1

Teres Minor

Answer 1

origin - lateral border of the scapula

insertion - greater tubercle of the humerus

isolated function - concentrically accelerates shoulder external rotation

integrated function -

• • eccentrically decelerates shoulder internal rotation
• • isometrically stabilizes the shoulder girdle

Question 2

Infrapinatus

Answer 2

origin - infraspinous fossa of the scapula

insertion - middle facet of the greater tubercle of the humerus

isolated function - concentrically accelerates shoulder external rotation

integrated function -

• • eccentrically decelerates shoulder internal rotation
• • isometrically stabilizes the shoulder girdle

Question 3

Subscapularis

Answer 3

origin - subscapular fossa of the scapula

insertion - lesser tubercle of the humerus

isolated function - concentrically accelerates shoulder internal roation

integrated function -

• • eccentrically decelerates shoulder external rotation
• • isometrically stabilizes the shoulder girdle

Question 4

Supraspinatus

Answer 4

origin - supraspinous fossa of the scapula

insertion- superior facet of the greater tubercle of the humerus

isolated function - concentrically accelerates abduction of the arm

integrated function -

• • eccentrically decelerates adduction of the arm
• • isometrically stabilizes the shoulder girdle