Muscles of the thorax

Question 1

External intercostal innervation

Answer 1

intercostal nerve (segmental inn.)

Question 2

External intercostal actions

Answer 2

elevation of the ribs

Question 3

External intercostal attachments

Answer 3

Going from rib to rib with orientation from superior-lateral to inferior-medial

“DOWN AND IN”

Question 4

Internal and innermost intercostals innervation

Answer 4

intercostal nerve (segmental inn.)

Question 5

Internal and innermost intercostals actions

Answer 5

depression of ribs

Question 6

Internal and innermost intercostals attachments

Answer 6

Going from rib to rib with orientation superior-medial to inferior-lateral

“DOWN AND OUT”

Question 7

Transversus thoracis innervation

Answer 7

intercostal nerves (segmental)

Question 8

Transversus thoracis actions

Answer 8

depresses ribs

Question 9

Transversus thoracis attachments

Answer 9

Going from posterior sternum –> costal cartilages

Question 10

Diaphragm innervation

Answer 10

phrenic nerve (C3-5)

Question 11

Diaphragm actions

Answer 11

main inspiratory muscle (inspiration)

inferior displacement causes negative thoracic pressure

Question 12

Diaphragm attachments

Answer 12

xiphoid process, inner surface of the lower ribs and costal cartilages, lumbar vertebrae via the crura —> the central tendon

Question 13

the intercostal nerves, arteries, and veins are positioned _____ to the _____

Answer 13

deep to the internal intercostal muscles

Question 14

the intercostal nerves, arteries, and veins are all positioned directly _____ to the _____

Answer 14

inferior to the ribs

Question 15

The internal thoracic artery is positioned _________ to the _______

Answer 15

posterior (deep), first 6 costal cartilages