Thorax Muscles

Question 1

Diaphragm origin

Answer 1

Xiphoid process, lower 6 costal cartilages, L1-L3 vertebrae

Question 2

Diaphragm insertion

Answer 2

Converges into central tendon

Question 3

Diaphragm action

Answer 3

Draws central tendon down and forward during inspiration

Question 4

Diaphragm innervation

Answer 4

Phrenic nerve

Question 5

Diaphragm blood supply

Answer 5

Pericardiacophrenic, musculophrenic, superior and inferior phrenic arteries

Question 6

Internal intercostals origin

Answer 6

Lower border of rib (11 pairs)

Question 7

Internal intercostal insertion

Answer 7

Upper border of rib below orgin

Question 8

Internal intercostal action

Answer 8

Forced expiration with exertion

Question 9

Internal intercostal innervation

Answer 9

Intercostal nerves

Question 10

Internal intercostal blood supply

Answer 10

Posterior and anterior intercostal arteries

Question 11

External intercostal origin

Answer 11

Lower border of rib (11 pairs)

Question 12

External intercostal insertion

Answer 12

Upper border of rib below origin

Question 13

External intercostal action

Answer 13

Inspiration with exertion and quiet breathing

Question 14

External intercostal innervation

Answer 14

Intercostal nerves

Question 15

External intercostal blood supply

Answer 15

Posterior and anterior intercostal arteries

Question 16

Serratus posterior superior origin

Answer 16

Ligamentum nuchae, spinous process of C7-T3

Question 17

Serratus posterior superior insertion

Answer 17

Superior aspect of ribs 2-4

Question 18

Serratus posterior superior action

Answer 18

Elevation of ribs

Question 19

Serratus posterior superior innervation

Answer 19

Ventral rami of upper thoracic nerves

Question 20

Serratus posterior superior blood supply

Answer 20

Posterior intercostal arteries

Question 21

Serratus posterior inferior origin

Answer 21

Spinous process of T11-L2

Question 22

Serratus posterior inferior insertion

Answer 22

Inferior aspect of ribs 9-12

Question 23

Serratus posterior inferior action

Answer 23

Depresses ribs

Question 24

Serratus posterior inferior innervation

Answer 24

Ventral rami of lower thoracic nerves

Question 25

Serratus posterior inferior blood supply

Answer 25

Posterior intercostal arteries

Question 26

Levatores costarum origin

Answer 26

Transverse processes C7-T11

Question 27

Levatores costarum insertion

Answer 27

Corresponding rib at superior border, between costal angle and tubercle

Question 28

Levatores costarum action

Answer 28

Assists with deep inspiration

Question 29

Levatores costarum innervation

Answer 29

Dorsal rami

Question 30

Levatores costarum blood supply

Answer 30

Posterior intercostal arteries

Question 31

Pectoralis minor origin

Answer 31

Ribs 3-5

Question 32

Pectoralis minor insertion

Answer 32

Corocoid process of scapula

Question 33

Pectoralis minor action

Answer 33

Depression of shoulder, downward rotation of scapula

Question 34

Pectoralis minor innervation

Answer 34

Medial Pectoral nerve

Question 35

Pectoralis minor blood supply

Answer 35

Pectoral branch of thoraco-acromial and intercostal lateral thoracic arteries