Shoulder muscles

Question 1

What is the origin of the pectoralis major?

Answer 1

Body of sternum, costocartilages, inferior-medial surface of the clavicle

Question 2

What is the insertion of the pectoralis major?

Answer 2

Greater tubercle of the humerous

Question 3

What is the origin of the pectoralis minor?

Answer 3

Ribs 3-5

Question 4

What is the insertion of the pectoralis minor?

Answer 4

Coracoid process of the scapula

Question 5

What is the origin of the serratus anterior?

Answer 5

ribs 1-8

Question 6

What is the insertion of the serratus anterior?

Answer 6

The medial border of the scapula

Question 7

What is the origin of the deltoid?

Answer 7

Lateral clavicle (Clavicular head), acromion (Acromial head) and spine of scapula (Spinous head)

Question 8

What is the insertion of the deltoid?

Answer 8

Deltoid tuberosity of the humerus, lateral humerus

Question 9

What are the functions of the 3 heads of the deltoid?

Answer 9

Together, they abduct the arm
Anterior: Flexes and medially rotates
Posterior: extends and laterally rotates
Middle: the primary abductor of the arm.

Question 10

Elevators of the scapula?

Answer 10

Upper trapezius
Rhomboids
Levator Scapulae

Question 11

Depressors of the scapula?

Answer 11

Lower trapezius
Serratus anterior
Lower Pectoralis major
Pectoralis minor
Lower lats

Question 12

Protractors of the scapula?

Answer 12

Serratus anterior
pectoralis minor
pectoralis major

Question 13

Retractors of the scapula?

Answer 13

Rhomboids
middle trapezius
upper lats

Question 14

Medial rotators of the scapula?

Answer 14

Levator scapulae
Rhomboids
Pectoralis minor

Question 15

Upward rotators of the scapula?

Answer 15

upper+lower trapezius
Serratus anterior