Muscles of the Pectoral Region

Question 1

pectoralis major (origin)

Answer 1

clavicle, sternum, and upper six costal cartilages

Question 2

pectoralis major (insertion)

Answer 2

lateral lip of bicipital groove of humerus

Question 3

pectoralis major (nerve)

Answer 3

medial and lateral pectoral nerves of brachial plexus

Question 4

pectoralis major (action)

Answer 4

adducts and internally rotates arm; clavicular fibers flex arm

Question 5

pectoralis minor (origin)

Answer 5

third, fourth, and fifth ribs

Question 6

pectoralis minor (insertion)

Answer 6

coracoid process of scapula

Question 7

pectoralis minor (nerve)

Answer 7

medial pectoral nerve from brachial plexus

Question 8

pectoralis minor (action)

Answer 8

depresses point of shoulder; if scapula is stabilized, elevates ribs of origin

Question 9

subclavius (origin)

Answer 9

first costal cartilage

Question 10

subclavius (insertion)

Answer 10

clavicle

Question 11

subclavius (nerve)

Answer 11

nerve to subclavius from upper trunk of brachial plexus

Question 12

subclavius (action)

Answer 12

depresses clavicle and steadies this bone during movements of the shoulder girdle

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)

Answer 15

long thoracic nerve

Question 16

serratus anterior (action)

Answer 16

shoulder protraction; rotates scapula