Week 8 Muscles

Question 1

Supraspinatus

Answer 1

O: supraspinous fossa of the scapula

I: superior greater tubercle of the humerus

A: abducts the shoulder at the glenohumeral joint
stabilizes the shoulder at the glenohumeral joint

Question 2

Infraspinatus

Answer 2

O: infraspinous fossa of the scapula

I: posterior greater tubercle of the humerus

A: externally rotates the shoulder at glenohumeral joint
adducts the shoulder at the glenohumeral joint
stabilizes the shoulder at the glenohumeral joint

Question 3

Teres Minor

Answer 3

O: superior (two thirds of the) lateral border of the scapula

I: posterior greater tubercle of the humerus

A: externally rotates the shoulder at the glenohumeral joint
adducts the shoulder at the glenohumeral joint
stabilizes the shoulder at the glenohumeral joint

Question 4

Subscapularis

Answer 4

O: subscapular fossa of the scapula

I: lesser tubercle of the humerus

A: internally rotates the shoulder at the glenohumeral joint
stabilizes the shoulder at the glenohumeral joint