Muscles of Thoracic Wall

Question 0

internal intercostal

Answer 0

O: inf border of ribs
I: sup border of ribs
N: intercostal nerve
A: during forced inspiration-- 
	interosseous part depresses ribs
	interchondral part elevates ribs

Question 1

external intercostal

Answer 1

O: inf border of ribs
I: sup border of rubs
N: intercostal nerve
O: elevate ribs during forced inspiration

Question 2

innermost intercostal

Answer 2

O: inf border of ribs
I: sup border of ribs
N: intercostal nerve
A: during forced inspiration--
	interosseous part depresses ribs
	interchondral part elevates ribs

Question 3

transversus thoracis

Answer 3

O: post surface of lower sternum
I: internal surface of costal cartilages 2-6
N: intercostal nerve
A: weakly depresses ribs

Question 4

subcostal

Answer 4

O: internal surface of lower ribs near their angles
I: sup borders of 2nd or 3rd ribs below
N: intercostal nerve
A: probably has same action as internal intercostals

Question 5

levatores costarum

Answer 5

O: transverse process of T7-T11
I: subjacent ribs b/w tubercles and angle
N: post rami C8-T11
A: elevate ribs

Question 6

serratus posterior superior

Answer 6

O: nuchal ligament, spinous processes C7-T3
I: sup borders of ribs 2-4
N: 2-5 intercostal nerves
A: elevate ribs

Question 7

serratus posterior inferior

Answer 7

O: spinous processes of T11-L2
I: inf borders of ribs 8-12 near their angles
N: 9-11th intercostal nerves
	subcostal (T12) nerve
A: depress ribs