Thorax & Lungs - Thorax mm

Question 1

What mm run rib-to-rib (intercostals)? (5)

Answer 1

external, internal, innermost (int), subcostal (int), transversus thoracis (int)

Question 2

What mm run rib-to-vertebrae? (3)

Answer 2

levator costarum, serratus posterior sup, serratus post inf

Question 3

How many pairs of external intercostals are there?

Answer 3

11

Question 4

Generally in what space do the ext intercostals lie?

Answer 4

space from rib tubercles posteriorly to costochondral junctions anteriorly

Question 5

What direction do the ext intercostals run?

Answer 5

anterior and inferior from rib above to rib below

Question 6

Action of external intercostals? (2)

Answer 6

elevate ribs; inspiration

Question 7

External intercostals innervation?

Answer 7

intercostal n at that level

Question 8

Generally in what space do the internal intercostals lie?

Answer 8

space from angle of rib posteriorly to sternum anteriorly

Question 9

What direction do the int intercostals run?

Answer 9

deep and perpendicular to the ext intercostals, run inf and post from floor of costal groove

Question 10

O/I of internal intercostals

Answer 10

floor of costal grooves to sup border of rib below

Question 11

Action of internal intercostals?

Answer 11

expiration

Question 12

Internal intercostals innervation?

Answer 12

intercostal n

Question 13

Innermost intercostals are deep to the ____________ but are separated from them by _____________________.

Answer 13

internal intercostals
intercostal nerves and vessels

Question 14

Direction of innermost intercostal fibers?

Answer 14

run inf and post; basically the same orientation of internal intercostals

Question 15

Where are the subcostals located?

Answer 15

lower thoracic wall (are similar to internal intercostals in orientation and function)

Question 16

O/I of subcostals?

Answer 16

internal surface of angle of one rib to internal surface of 2nd or 3rd rib inferior

Question 17

O/I of transverse thoracis?

Answer 17

4-5 slips from xiphoid and inf sternum to 2-6th rib costal cartilage

Question 18

What thorax mm generally aid in expiration movements? (4)

Answer 18

internal intercostals, innermost intercostals, subcostals, transverse thoracis

Question 19

O/I of levator costarum?

Answer 19

O - TP of C7, T1-11

I - costal tubercle area

Question 20

Fiber direction of levator costarum?

Answer 20

inferolaterally

Question 21

Action of levator costarum (2)

Answer 21

inspiration, proprioception

Question 22

Innermost Intercostal mm innervation

Answer 22

intercostal nerve at that level

Question 23

diaphragm flattens as it contracts and increases ____ ____ of thorax

Answer 23

potential space (between two adjacent structures normally pressed together)

Question 24

diaphragm is innervated by the

Answer 24

phrenic nerve (C3-5)

Question 25

diaphragm is innervated by the

Answer 25

phrenic nerve (C3-5)