Muscles of the Pectoral Region and Back

Question 1

Pectoralis major origin

Answer 1

anterior sternal end of the clavicle, sternum, ribs 1-6, aponeurosis of the external oblique

Question 2

Pectoralis major insertion

Answer 2

crest of the greater tubercle of the humerus

Question 3

Pectoralis major nerve

Answer 3

lateral and medial pectoral nerve

Question 4

Pectoralis major action

Answer 4

adducts, flexes, extends (when it is flexed, not backwards extension), and medially rotates arm

Question 5

Pectoralis minor origin

Answer 5

rips 3-5 (costochondral junction)

Question 6

Pectoralis minor insertion

Answer 6

coracoid process

Question 7

Pectoralis minor nerve

Answer 7

medial pectoral

Question 8

Pectoralis minor action

Answer 8

depresses scapula, elevate ribs (stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall)

Question 9

Subclavius origin

Answer 9

1st rib (costochondral junction)

Question 10

Subclavius insertion

Answer 10

inferior acromial end of clavicle

Question 11

Subclavius nerve

Answer 11

subclavian

Question 12

Subclavius action

Answer 12

flexes clavicle or elevates 1st rib

Question 13

Serratus anterior origin

Answer 13

ribs 1-8(9)

Question 14

Serratus anterior insertion

Answer 14

deep medial border of the scapula

Question 15

Serratus anterior nerve

Answer 15

long thoracic

Question 16

Serratus anterior action

Answer 16

rotate and protract scapula (pulls medial border forward), elevate ribs, it is the deepest scapula muscle

Question 17

Trapezius origin

Answer 17

occipital protuberance through T12 nuchal ligament

Question 18

Trapezius insertion

Answer 18

superior margin of scapular spine and anterior acromial end of the clavicle

Question 19

Trapezius nerve

Answer 19

accessory and cervical plexus

Question 20

Trapezius action

Answer 20

rotate scapula, abduct and extend head

Question 21

Levator scapulae origin

Answer 21

transverse processes C1-4

Question 22

Levator scapulae insertion

Answer 22

superior angle of scapula

Question 23

Levator scapulae nerve

Answer 23

dorsal scapular

Question 24

Levator scapulae action

Answer 24

elevate scapula

Question 25

Rhomboideus minor origin

Answer 25

spinous processes C7-T1

Question 26

Rhomboideus minor insertion

Answer 26

medial border of scapula at spine

Question 27

Rhomboideus minor nerve

Answer 27

dorsal scapular

Question 28

Rhomboideus minor action

Answer 28

retracts and elevates scapula

Question 29

Rhomboideus major origin

Answer 29

spinous processes T1-4

Question 30

Rhomboideus major insertion

Answer 30

medial border of scapula inferior to spine

Question 31

Rhomboideus major nerve

Answer 31

dorsal scapular

Question 32

Rhomboideus major action

Answer 32

retracts and rotates scapula