MUSCLES OF THE THORACIC WALL

Question 1

Pectoralis Major (Origin)

Answer 1

Clavicle, sternum, upper 6
costal cartilages

Question 2

Pectoralis Major (Insertion)

Answer 2

Lateral lip of bicipital
groove of humerus

Question 3

Pectoralis Major (Nerve Supply)

Answer 3

Medial and lateral pectoral
nerves (C5, 6, 7, 8;T1)

Question 4

Pectoralis Major (Action)

Answer 4

Adducts, and medially
rotates arm; clavicular
fibers flex arm

Question 5

Pectoralis Minor (Origin)

Answer 5

3rd, 4th, 5th ribs

Question 6

Pectoralis Minor (Insertion)

Answer 6

Coracoid process of
scapula

Question 7

Pectoralis Minor (Nerve Supply)

Answer 7

Medial pectoral nerve (C6,
7, 8)

Question 8

Pectoralis Minor (Action)

Answer 8

Depresses point of
shoulder/ elevates ribs of
origin

Question 9

Subclavius (Origin)

Answer 9

1st costal cartilage

Question 10

Subclavius (Insertion)

Answer 10

Clavicle

Question 11

Subclavius (Nerve Supply)

Answer 11

Nerve to subclavius (C5, 6)

Question 12

Subclavius (Action)

Answer 12

Depresses clavicle;
stabilizes during Sh motion

Question 13

Serratus Anterior (Origin)

Answer 13

Upper eight ribs

Question 14

Serratus Anterior (Insertion)

Answer 14

Medial border and inferior
angle of scapula

Question 15

Serratus Anterior (Nerve Supply)

Answer 15

Long thoracic nerve (C5, 6
, 7)

Question 16

Serratus Anterior (Action)

Answer 16

Protraction and upward
rotation of scapula