Muscles of Respiration

Question 1

diaphragm

Answer 1

O: cartilage of ribs 7-12 inner surfaces/lumbar vertebrae/xiphoid process
I: central tendon
A:primary muscle in respiration
I: phrenic

Question 2

external intercostal

Answer 2

O: inferior border of rib
I: superior border of next lower rib
A: elevation of ribs (inhalation)
I: 1-11 intercostal nerves

Question 3

internal intercostal

Answer 3

O: inferior border of ribs
I: superior border of next lower rib
A: depression of ribs (exhalation)
I: 1-11 intercostal nerves