Thorax & Back Muscles Origin/ Insertion

Question 1

Pectoralis major (o)

Answer 1

Clavicle, sternum cartilages of first 6 or 7 ribs, aponeurosis of external oblique

Question 2

Pectoralis major (I)

Answer 2

Greater tubercle of humerus

Question 3

Pectoralis minor (o)

Answer 3

3rd-5th ribs

Question 4

Pectoralis minor (I)

Answer 4

Coracoid process of scapula

Question 5

Serratus anterior (o)

Answer 5

Superior 8 or 9 ribs

Question 6

Serratus anterior (I)

Answer 6

Anterior surface of vertebral border of scapula

Question 7

Deltoid (o)

Answer 7

Clavicle, acromion and spine of scapula

Question 8

Deltoid (I)

Answer 8

Deltoid tuberosity of humerus

Question 9

Trapezius (o)

Answer 9

Superior nuchal line of occipital bone, ligamentum nuchae, spines of C7 and all thoracic vertebrae

Question 10

Trapezius (I)

Answer 10

Clavicle, acromion and spine of scapula

Question 11

Latissimus dorsi (o)

Answer 11

Spines of inferior 6 thoracic vertebrae and lumbar vertebrae (via thoracolumbar fascia), iliac crest, inferior 3-4 ribs, inferior angle of scapula

Question 12

Latissimus dorsi (I)

Answer 12

Intertubercular groove of humerus

Question 13

Infraspinatus (o)

Answer 13

Infraspinous fossa of scapula

Question 14

Intfraspinatus (I)

Answer 14

Greater tubercle

Question 15

Teres minor (o)

Answer 15

Lateral border of posterior surface of scapula

Question 16

Teres minor (I)

Answer 16

Greater tubercle

Question 17

Teres major (o)

Answer 17

Inferior angle of scapula on posterior surface

Question 18

Teres major (I)

Answer 18

Lesser tubercle on anterior humerus