Muscles of Respiration

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

pericardiophrenic artery, superior and inferior phrenic arteries

Question 6

Internal intercostals (origin)

Answer 6

lower borders of ribs (11 pairs)

Question 7

Internal intercostals (insertion)

Answer 7

upper border of ribs below origin

Question 8

Internal intercostals (action)

Answer 8

forces expiration with exertion

Question 9

Internal intercostals (innervation)

Answer 9

phrenic nerve

Question 10

Internal intercostals (blood supply)

Answer 10

posterior and anterior intercostal arteries

Question 11

External intercostals (origin)

Answer 11

lower borders of ribs (11 pairs)

Question 12

External intercostals (insertion)

Answer 12

upper border of ribs below origin

Question 13

External intercostals (action)

Answer 13

inspiration with exertion and quiet breathing

Question 14

External intercostals (innervation)

Answer 14

intercostal nerves

Question 15

External intercostals (blood supply)

Answer 15

posterior and anterior intercostal arteries