Muscles of respiration

Question 1

Diaphragm

Answer 1

Main muscle of inspiration
Right hemi sits 2cm higher than left hemi
Superior surface covered with parietal pleura

Question 2

Diaphragm innervation

Answer 2

Phrenic nerve (C3,4,5)

Question 3

Intercostals

Answer 3

Pass between adjacent ribs
External intercostals- muscles of inspiration, elevate ribcage
Internal intercostals- muscles of expiration, depress ribcage
Innermost intercostals- stabilize chest wall

Question 4

Intercostals innervation

Answer 4

Intercostal nerves (T1-11)

Question 5

Accessory muscles of inspiration

Answer 5

Scalenes elevate ribcage
Sternocleidomastoid elevates ribcage
Pec major and minor- aid expansion of thoracic cavity

Question 6

What is using accessory muscles a sign of?

Answer 6

Respiratory distress

Question 7

Forced expiration muscles

Answer 7

Expiration brought about by relaxation of diaphragm and external intercostals
Forced expiration brought about by contraction of internal intercostals and abdominal muscles

Question 8

What is use of abdominal muscles a sign of?

Answer 8

Respiratory distress