Muscles of Respiration

Question 1

What goes through the 3 major openings in the diaphragm and where are they located? (roughly)

Answer 1

T8- Inferior vena cava- most anterior
T10- Esophagus and Vagal trunks (bc u eat in vegas) - middle
T12- Aorta, Azygos and thoracic duct - closest to vertebral column

Question 2

Where is the transverse thoracic plane line and what happens there?

Answer 2

line drawn at sternal angle (level of T4/5)

trachea bifurcates there, and the azygos vein drains into the superior vena cava

Question 3

Mm involved in quiet inspiration (3)

Answer 3

diaphragm, external/internal intercostals

Question 4

mm involved in quiet expiration (1 1/2)

Answer 4

passive/elastic recoil, abdominal mm

Question 5

mm required for forced inspiration (8)

Answer 5

diaphragm, internal/external intercostals, sternocleidomastoid, scalenes, levator costarum, serratus posterior superior, pec minor

Question 6

mm required for forced expiration (6 1/2)

Answer 6

elastic recoil, rectus abdominis, obliques, serratus posterior inferior, internal intercostals, innermost intercostals, transversus thoracis