Muscles of respiration

Question 1

O: L1-L3 , Ribs 6-12 , Xiphoid process of the sternum
I: Central tendon (cloverleaf-shaped aponeurosis)

Answer 1

DIAPHRAGM (FIG. 21.131)
A: Descends or moves inferiorly during inhalation, which helps move air into the lungs Increases intraabdominal pressure
N: Phrenic nerve

Question 2

O: Inferior border of rib (above)
I: Superior border of rib (below)

Answer 2

EXTERNAL INTERCOSTALS (FIG. 21.132)
A: Elevates the ribcage during inhalation, Maintains the intercostal spaces
N: Intercostal nerves

Question 3

O: Superior border of rib (below)
I: Inferior border of rib (above)

Answer 3

INTERNAL INTERCOSTALS (FIG, 21.133)
A: Depresses the ribcage during exhalation (forced), Maintains the intercostal spaces
N: Intercostal nerves

Question 4

O: Spinous processes of C7-T3
I: Ribs 2-5 (posterior surface)

Answer 4

SERRATUS POSTERIOR SUPERIOR (FIG. 21.134)
A: Elevates the ribs during inhalation
N: Intercostal nerves

Question 5

O: Spinous processes of T11-L2
I: Ribs 9-12 (posterior surface)

Answer 5

SERRATUS POSTERIOR INFERIOR (SEE FIG, 21.134)
A: Depresses the ribs during exhalation
N: Intercostal nerves (T9-T12)